The assembly of the canton Glarus

Swiss democracy

Quality of government

The ideal of a democracy is that the people determine what their government does. Usually, citizens elect politicians every few years. These politicians then make the decisions. Quite often, these decisions differ from what their citizens wish. The reasons may include lobbying, deal-making, party politics, and political games. Leaders may also earnestly believe that going against the will of their people is for the best. Unburdened by responsibilities, citizens may have unrealistic desires.

Democracy doesn’t guarantee high-quality decisions, so there have always been pundits questioning the merits of democracy. No form of government guarantees high-quality choices. It is helpful to distinguish between the quality of the government and its decisions and the quality of democracy. Improving governance is far more complex than improving democracy, which is relatively straightforward, and the subject of this section, which can remain relatively brief for that reason.

In a well-functioning democracy, the government acts following the will of the citizens. In this respect, one political system stands out: the Swiss system. The great thing about it is that it is a proven concept rather than a figment of a political philosopher. In Swiss democracy, authority operates from the bottom up. It is a design flaw, as the world is interconnected, so our choices have consequences for people in other parts of the world. That is why, in most states, including democracies, authority operates top-down.

Features

The Swiss political system features a unique combination of representative and direct democracy. The government and parliament administer the country’s daily affairs, but if citizens feel the desire to take matters into their own hands, they can demand a referendum. The government must respect its outcome.1 Switzerland has the following referendum types:

  • mandatory referendums on changes in the federal constitution
  • optional referendums on federal laws when a specified number of citizens ask for it
  • Similar rules exist on the state and municipal levels.

Switzerland has 26 cantons, which are akin to member states, and over 2,000 municipalities that enjoy a significant degree of autonomy. The Swiss constitution promotes making decisions at the lowest possible level and delegating power to a higher level only if deemed beneficial.

The Swiss elect their National Council every four years. It has proportional representation. Citizens can vote for a political party, as well as for specific persons on the party’s candidate list. The Swiss can cast multiple votes, often one for each available seat in their constituency, allowing them to vote for several candidates and parties.

Switzerland also has a Council of States. All the Cantons have seats, for which there are also elections. Most have two, and a few smaller Cantons have one. Decisions require a majority on the national level in the National Council as well as among the Cantons in the Council of States. The Swiss citizens can overturn these decisions in referendums.

The seven-member Federal Council, elected by the National Council and Council of States together, handles the daily affairs of government. All the major political parties have seats in it. The Federal Council aims for consensus but may revert to voting if it is impossible to reach an agreement. Referendums ensure that this hardly happens.

Evaluation

Referendums have the following consequences:

  • The combination of representatives and referendums keeps citizens in control while unburdening them of daily government affairs. They don’t have to vote on every single matter, but can vote on an issue if they feel it is necessary.
  • Referendums are yes-or-no questions. Before crafting laws, the government consults with various interest groups and considers their concerns. That prevents laws from being voted out in referendums.
  • Whatever choices are made, they are the citizens’ choices. It can breed a sense of responsibility as citizens live with the consequences of their choices. If things go wrong, they can’t blame their politicians.
  • There are fewer political games, coalitions, and deals, as citizens can vote out laws they disagree with. It also promotes stability and cooperation. The largest political parties are in government and aim for consensus.

The distribution of power has the following consequences:

  • There is no single decision maker with a lot of power, such as the President in the United States. The Federal Council performs the daily task of governing, and the largest political parties all have seats in it.
  • Proportional representation in parliament enables multiple political parties that align with the preferences of voters. Small shifts in voter preferences have a minimal impact on the political landscape.
  • The Swiss National Council represents the federation, while the Council of States represents the Cantons. A decision requires a majority in both. This provision aims to safeguard the interests of the rural cantons with smaller populations.

Considerations

Switzerland doesn’t have a Constitutional Court or a House of Parliament to ensure that the Constitution and human rights are respected. Switzerland is bound by the treaties it signed. The Swiss political system is one of the most democratic, but it tends to be conservative. Women received the right to vote only in 1971, as only men could vote.

The Swiss political system is one of the most democratic in the world. And it has safeguards that provide political stability. As referendums are yes-or-no questions, laws require careful crafting and consideration of the concerns of citizens. There are several theories about democracy, but the Swiss political system has proven to work.

In the Swiss political system, authority is decentralised. Delegation of responsibilities is bottom-up. It works from lower levels to higher ones. Most states have a top-down delegation. It flows from the higher levels to the lower ones. That is preferable as decisions in one district can affect other districts as well.

It is also the case at the global level. Switzerland is sovereign. It has been a freeloading country as Swiss banks have been a haven for criminals, tax evaders and dictators from other countries. Had the people of those countries had a say in this matter, that would not have happened. In a global democracy, every world citizen has an equal say.

Latest revision: 11 July 2025

Featured image: The assembly of the canton Glarus. Democracy International (2014). [copyright info]

1. Switzerland’s Direct Democracy. http://direct-democracy.geschichte-schweiz.ch/ [link]

Liberal democracy

A definition

Democracies are often called liberal democracies. So what is a liberal democracy and why might it be the best way of government? There are no easy answers to these questions nor is there agreement on these matters. Liberalism emphasises the value of individuals while democracy is rule by majority. These two principles can be at odds.

Liberal democracies have elections between multiple political parties, a separation of powers into different branches of government, the rule of law in everyday life, an open society, a market economy with private property, the protection of human rights, civil rights, civil liberties and political freedoms for everyone.1

Liberals believe that individuals and social groups have conflicts of interest. The social order must deal with these conflicts and resolve them in a peaceful manner. To achieve such a feat, all parties must be reasonable and there should be a balance of powers. No party should be able to force its will upon others.2 It is an important reason why liberals stress the importance of individual rights.

Democracy means that government decisions require the consent of the majority of the citizens. In most cases the citizens elect a parliament that does the decision making for them. Sometimes citizens can vote for individual proposals in referendums. In reality many democratic countries aren’t fully democratic because not all government decisions are supported by a majority of the citizens.

Principles

Liberal democracy is based on a social contract, which is an agreement amongst the members of society to cooperate for mutual benefits. For instance, labourers may accept capitalism if they get a share of prosperity. That deal turned out to be more attractive than state ownership of the means of production.

Liberalism has two principles that can be at odds, namely non-interference with people’s lives and realising everyone’s potential. In this vein there are two branches of liberalism:

  • Economic liberalism promotes freedom of the markets as well as free trade and claims that the state should be of minimal size and not interfere with people’s lives.
  • Social liberalism claims that the state should help to realise the potential of people by promoting their freedom to make choices, which includes ending poverty.

Each liberal democracy more or less embraces these values. Liberal democracies come with a market economy and respect for the rights of individual citizens. Governments interfere with the lives of people and try to promote their happiness and to realise their potential. The conflicting nature of both principles makes liberal democracies differ with regard to freedom of markets and government interference.

In the United States liberalism has a different meaning. There it is another word for social liberalism or democratic socialism. In Europe the definition of liberalism is broader and this is also the definition used here. In the 17th century liberal ideas began to emerge in what is called the European Enlightenment. Around the year 1700 the philosopher John Locke came up with the following basic principles for a liberal state:

  • a social contract in which citizens accept the authority of the state in exchange for the protection of their rights and property and maintaining the social order;
  • consent of the governed, which means that state power is only justified when the people agree;
  • separation of church and state, which means that the state doesn’t favour a specific religion and does not require a religious justification.3

Is it the best form of government?

Liberal democracy is part of the European cultural heritage. Proponents claim that it is the best form of government. These universalist claims are sometimes contested on the ground that they are a form of western cultural imperialism. Another argument is that there is no guarantee that liberal democracy leads to better decisions. From a religious perspective people argue that our Creator may prefer a different kind of social order and government, possibly even a theocracy.

The argument in favour of the universalist claims is that liberal democracy emerged out of a historical process that took centuries in which rational arguments played a decisive role. The European Enlightenment challenged existing practices in government on the basis of reason. Ideas that emerged out of the European Enlightenment were tried out in different ways and refined further. Europeans also invested heavily in educating their citizens. This produced a culture of reason and compromise as well as a massive body of practical experience and best practises.

There is also no guarantee that other forms of government lead to better decisions. In an open society better information can be available so well-educated citizens in a culture of reason and compromise may make better decisions. There are a few democracies that live up to these expectations so it can work out that way. And we may not be able to determine what kind of order God desires. If our Creator is all-powerful then the emergence and spread of liberal democracy may not be God’s plan.

One of the biggest problems facing liberal democracy is high expectations. Liberal democracy itself does not guarantee a reliable government that is both efficient and effective nor does it ensure a flourishing economy. This has led to disappointments. A failed and corrupt government can’t simply be turned into a success by allowing elections. Liberal democracy works best with a well-educated population in a culture of reason and compromise that doesn’t allow for corruption and abuse of power.

On the moral front there are a few issues too. Liberal democracy promises equal treatment for all people. In reality people aren’t treated equal nor do they have equal opportunities. There is discrimination based on ethnicity, gender or sexual preferences. And poor people have fewer opportunities than rich people. Still, the goal of equal treatment and equal opportunities can be something to strive for. It may be better to aim for such goals and fail from time to time than not having these goals at all.

If liberalism promotes tolerance then how to deal to intolerant people? Should their intolerance be tolerated? If people do not accept liberal values, should they be educated or should these values be imposed? And are free markets the best way of organising the economy or is government involvement advised? If the economy is served by stability, should dissent that causes instability be suppressed? An excessive or unnecessary use of force can undermine the foundation of liberal democracy as liberal democracy is based on reason and convincing people by argument. And indeed it is possible that liberal democracy can be overturned.

History

The preconditions for liberalism had already emerged in Western Europe during the Middle Ages. There was a larger degree of individualism than elsewhere. Liberalism itself emerged during the sixteenth century. At the time Europe was ravaged by devastating religious wars. After several decades of warfare Europeans grew tired of the conflict and began to tolerate religious differences. Some catholic countries accepted protestant minorities while many protestant countries accepted catholic minorities. Germany was almost equally divided. At the time Germany consisted of small states that had either protestant or catholic rulers.

This religious tolerance was at first more or less an uneasy truce. No party had been able to gain the upper hand. Religious minorities at first didn’t receive equal rights. They were only tolerated. Over time the case for religious tolerance became more widely accepted. It was based on two major arguments.

  • The argument of ignorance which states that only God knows who is on the right path and who is doomed so humans shouldn’t judge others.
  • The argument of perversity which states that cruelty is at odds with Christian values and that religious persecution strengthens the resolve of the persecuted.1

The concept of tolerance expanded into a general concern for the rights of individual citizens. In the 17th century liberal ideas were spreading. The Glorious Revolution of 1688 in England limited the power of the king. The rights of individuals were written down in the Bill of Rights. Parliament became the most powerful political institution based on the principle of consent of the governed. The 1776 Declaration of Independence of the United States was based on liberal principles too. It states that all men are created equal and have certain unalienable rights like life, liberty, and the pursuit of happiness.2

The founding fathers of the United States were also early liberals. The United States Constitution reflects this view. The aim of the United States Constitution is, amongst others, to safeguard the rights of individuals against the state. A large group of Americans believe that individual rights should prevail against democratically elected governments. The widespread support for gun ownership in the United States comes from a distrust of the state as a protector of life, liberty and possessions.

Democracy had not been a seriously considered since classical antiquity. It was believed that democracies are inherently unstable and chaotic due to the changing whims of the people.1 The violence during the French Revolution supported these views. It began as a popular uprising incited by liberal ideas but it soon turned into chaos and bloodshed. Order was restored by a despot ruler named Napoleon Bonaparte who did much to spread liberal reforms throughout Europe by ending the feudal system, emancipating religious minorities and imposing a liberal code of law. The spread of liberal ideas proved to be lasting and democracy was to follow a century later.

The Industrial Revolution started a period of accelerated and constant change that was disastrous for many who found themselves on the losing side. The ruling class changed. Nobility was replaced by a new elite of business people. The position of craftsmen was undermined by factories. And workers in factories laboured under miserable conditions for low wages. There were three major ways of confronting these changes:

  • Conservatives tried to hold on the old order of community, religion and nobility.
  • Socialists tried to overturn the elite of business people by giving power to workers.
  • Liberals tried to manage the change, thereby implicitly supporting the order in which business people were the ruling class.

Liberalism often coincides with the interests of business people. They have possessions and some are rich. They feared that the poor might vote for handing over their possessions to the poor. Socialism became the embodiment of this fear. Liberals were at first inclined to limit the right to vote to people who pay taxes because this excluded poor people from voting. When the threat of socialism became subdued and socialists were willing to compromise, liberals came to accept democracy based on the principle of one person one vote.

In the 19th century European countries held vast colonial empires. These colonies were kept for profit. It was generally believed that the people in these colonies had to be educated before they would be able to govern themselves. The colonial era helped to modernise these countries and most Europeans at the time believed that the oppression and the economic exploitation were justified on these grounds. There were only a few dissenters, for instance the Dutch writer Multatuli.

Liberal democracy faced a few major crises like World War I, the Great Depression and World War II. World War I demonstrated that liberal democracy and free trade weren’t a guarantee for peace and stability. The Great Depression once again challenged liberal democracy as the Soviet Union remained unaffected while Nazi Germany was able to recover and achieve full employment while other countries were still struggling. And during World War II Nazi Germany overran most democratic countries in Europe.

After World War II the European colonies became independent. The Soviet Union came to dominate Eastern Europe and China became a communist country. The United States became the protector of liberal democracy but also a number of dictatorships. This era is called the Cold War and it lasted until the Soviet Union dismantled itself after allowing the peoples of Eastern Europe to make their own choices. Major challengers of liberal democracy nowadays are the one-party system in China and political Islam.

The citizens of Hong Kong and Taiwan don’t like to lose their freedoms. Chinese too probably prefer freedom if they have a choice. And the Islamic State has shown Muslims all around the globe that political Islam can easily turn into a reign of terror. The foundations of liberal democracy may be strong, but a collapse of the global economy may turn be a more serious threat to liberal democracy than the alternatives. Reason can easily disappear once people become fearful of the future.

Reasons for success and limitations

The success of liberal democracy is therefore not a historical necessity. Liberal democracy might never have been invented or dictatorships could have gained the upper hand. That didn’t happen. Communist and fascist dictatorships came and went. Perhaps liberal democracy is a temporary phenomenon but we can’t know that now. Only the future can tell. There are a number of causes that might explain the strength of liberal democracy.

  • Liberal democracy is based on the consent of the governed so it is has the consent of the governed by default while other forms of government do not.
  • Science greatly contributes to the success of states and science is best served with an open debate that liberal democracy provides.
  • The economy greatly contributes to the success of states and the economy is best served with individual rights that liberal democracy provides.

A despot ruler or a ruling party in a one-party system might have the consent of its subjects, but if not, only force remains for the ruler or the party to maintain power. Liberal democracies usually resolve such issues peacefully through elections, making liberal democracy more stable by default. Intellectual freedom is helpful to science while economic freedom is helpful for the economy, so liberal democracy can be a potent force. Only when leadership is required, liberal democracy might not always be adequate.

Liberalism has no higher moral value than the individual, which is peculiar because the individual human is an insignificant part of this universe. And individualism may be at odds with human nature as humans are social animals. Humans are not atomic beings that choose to cooperate for mutual benefit like liberalism supposes. Cooperation is part of human nature and not a choice individuals deliberately make.

It is the success in cooperation that makes a society win out. Liberalism gives a framework for living together in peace as long as all major parties are reasonable and willing to compromise. This makes larger scale cooperation possible and that can make a society successful. For instance, the United States integrated people from different cultural backgrounds, which contributed to the success of the United States as a nation.

It is said that history is written by the victors. Strength may be the reason why liberal democracy prevailed. Liberal philosophers have tried to provide a moral justification for liberal democracy or they may have opposed it or they may have tried to improve it. Liberal democracy emerged out of thought and action, experiment and failure, and it was a process that took centuries. Philosophers like Locke contributed to its success as they set out the goals people could strife for.

Apart from individualism, liberal societies lack a higher purpose. From a scientific viewpoint there is no higher purpose to this universe. The moral codes humans live by are not more than an agreement. Only when this universe is created for a purpose there is a reason for our existence. But moral individualism can be dangerous. The challenges humanity is currently facing, most notably living within the limits of this planet, most likely requires making individuals subject to a higher causes like the survival of humanity and caring for the planet.

1. Liberal democracy. Wikipedia.
2. Liberalism: The Life of an Idea. Edmund Fawcett (2015). Princeton University Press.
3. History of liberalism. Wikipedia.

Texel Rommelpot Tulips View West.

Wisdom of Crowds and Mass Delusions

Emergent properties

How well groups make decisions depends on how their members share information and form opinions. In this regard, there are two opposing ideas: the wisdom of crowds versus mass delusions. As a collective, we know far more than any individual, but collectives can act more stupidly than most individuals would alone. You can more easily reason with individuals than with groups. Shared beliefs hold a group together and define its identity. Hence, groups are likelier to stick to their beliefs than individuals when confronted with evidence that they are wrong. Groups know more, but are also less rational than most of their members would be on their own. As the number of individuals in a group increases, their knowledge increases while their wisdom decreases.

Why is that? Groups aren’t merely the sum of their members. Groups have what experts call emergent properties. These are properties that emerge when individuals form a group. These properties seemingly appear out of nowhere. An individual water molecule can’t generate a wave, but billions of water molecules in a lake can. One cell doesn’t make a horse or a rabbit, but billions of cells do. A group of starlings can fly in intriguing patterns, which a single starling can’t. A single neuron can’t produce awareness. These properties emerge from the properties of the individuals. Individuals have properties that determine what they can do in groups, so a group of starlings can fly in intriguing patterns, while a group of humans can’t. And a group of water molecules can’t become a rabbit.

Collective intelligence

Collectives cooperate and achieve much more than individuals. And they can process more information, which the experts call collective intelligence. Their strength lies in their cooperation and in sharing knowledge. Bees and ants demonstrate collective intelligence. They share information about where to find food and use it collectively. Bees build beehives using a sophisticated division of labour, while ants can collectively defeat enemies many times their size.1

It is a natural behaviour of bees and ants. Ants also demonstrate what can go wrong with collective intelligence. They follow each other’s trails. If an ant accidentally walks in a circle, an entire colony might follow it. They could end up walking in circles until they die. In this case, otherwise beneficial behaviour goes wrong with fatal consequences. That is collective stupidity.1 We cooperate based on shared beliefs, which can be incorrect. Usually, our beliefs are beneficial. They strengthen the group’s cohesion, which is often more crucial to our survival than being right.

Groups know more and perform better on quiz questions than individuals because they can share knowledge. In 1906, an Englishman named Francis Galton discovered a phenomenon, later dubbed the ‘wisdom of crowds’. Galton visited a livestock fair where an ox was on display. In a contest, the villagers estimated the animal’s weight. Nearly 800 people participated. No one guessed the weight of 1,198 pounds, but the average of the estimates was 1,207 pounds, thus less than 1% off the mark.

Galton concluded that the finding suggests that democracy is the best form of government. Taking every view into account in Parliament could result in the best possible decisions. At the fair, the contestants independently assessed the ox’s weight. They didn’t arrive at their estimate in a group process, which may explain why it worked so well.2 And so, the term ‘wisdom of crowds’ is deceptive because it is merely the aggregate estimate of independently thinking individuals.

No wisdom of crowds

There is no wisdom of crowds, but the stupidity of groups does exist. A single Jew can make peace with a single Palestinian, but the Jews and the Palestinians as peoples have failed to do so. Groups have collective intelligence, so they process more information than an individual. Humans are social animals rather than rational beings. Crowds can make better estimates on aggregate, but only as independent individuals, so if their members don’t influence each other.

As long as we retain an independent perspective, we can’t develop groupthink and become collectively stupid. When we influence each other, we can go collectively crazy. We desire our peers’ approval, which clouds our judgment. We are social animals who need the group to survive, so we share our group’s beliefs and don’t openly disagree when we don’t. We may share ideas we know are incorrect, so we ignore our knowledge and pass on the group’s views.

We are prone to moral panics, which undermine our rational thinking. A moral panic is a widespread feeling that some evil person or group schemes against our interests and well-being. Often, genuine concerns are causing these feelings, but the claims exaggerate the harm’s seriousness, extent, and certainty. Usually, the panic comes with false claims inciting hatred and fear. The role of moral panics is to promote group cohesion and generate collective action to remove the perceived threat.

Herd behaviour

Information often spreads through herd behaviour. We usually behave the same way.1 YouTube makes use of it. If you come across a video with ten million views, you are more likely to watch it than one with only ten views. Usually, videos with ten views are not worth watching. In most cases, herd behaviour works to our advantage. It allows individuals to survive with less knowledge by depending on collective intelligence. We can’t know everything, so it is usually better to follow the herd. That saves time and energy. Social media is prone to herd behaviour. A cat video can become more popular because it’s already in favour, while a funnier one may go unnoticed.

The same is true for markets. During the Dot-com bubble, investors piled into Internet stocks. Many investors knew these stocks were crap, but they bought them anyway because they kept rising. Groupthink can cause stock market bubbles. In 1841, Charles Mackay wrote about three financial manias: Tulipomania in the Netherlands, John Law’s Mississippi Scheme, and the South Sea Bubble. He argued that greed and fear drive financial markets and can make people act irrationally to the point that people believe a tulip is worth a mansion.3

Confidence game

Information spreads via opinion makers like influencers and can lead to mass delusions. Confident but mistaken people play a crucial role. Self-assured people aren’t always wrong, but when they are, they amplify their errors because they have followers. Most people are insecure and follow the lead of people who appear self-assured. Leaders must be self-assured. Otherwise, no one will follow them. The business of influencers on the Internet is making money out of insecure people by advertising products no one needs.

Confidence is contagious. During the Dot-com bubble, the loudest voices on Internet message boards boasted about their profits in Internet stocks, thereby pulling in more suckers. The quality of group decisions depends on how we aggregate information. To take advantage of collective intelligence, we should try to:

  • make people feel free to come forward with their information and opinions;
  • prevent groupthink or group members from becoming biased by the information or opinions of others;
  • and focus on the underlying causes rather than incidents.

That is difficult in small groups and even harder in societies. It goes against human nature. We follow confident people. And we don’t always like to hear the truth. The most successful politician in Dutch history was Mark Rutte, who became the longest-serving Prime Minister. He is jovial and cheerful. He was also the most prolific liar, and no Dutch politician had ever lied so often and with such confidence. Rutte once admitted that he had no vision, which probably is not a lie. It allowed him to remain pragmatic and make deals.

Rutte’s talents are now coming in handy as he has become the Secretary General of NATO. So far, he has succeeded in keeping the United States on board by praising Donald Trump for being a master strategist. Humans cooperate based on fairy tales, so lying is in our nature. We even learn to believe the lies, so that they become the truth to us. But if our leaders are friendly, visionless, pragmatic deal-makers, who lie to stay in power, we are surely doomed, given the magnitude of the problems humanity faces.

Collective action

Large groups struggle with collective action problems. The larger the group, the less effective it becomes at addressing challenges. Today, humanity faces global collective action problems, most notably the looming technological-ecological apocalypse and the increasing likelihood of another world war. It has become impossible to hide our incompetence in addressing them. The inconvenient truth is:

  • It is unlikely that we can save ourselves, as the wit of a single worm already exceeds the collective wisdom of humankind. You would make better decisions if you were the leader of the world, even if your judgment is subpar.
  • We must agree on what to do. In cases of fundamental disagreements, we fight. We cooperate based on fairy tales. Force rather than reason is our most convincing argument. The ideas that won out often did so by force.
  • Non-contributors benefit from the group effort while enjoying the advantages of not contributing. If they get away with it, the free-loading will spread. It will undermine the group’s morale, and the collective effort will collapse.
  • Most notably, people in the West suffer from the mass delusion that individual freedom and the interplay of personal interests and preferences through markets and elections ensure the best outcome for the general good.

By withdrawing from the Paris Agreement on combating climate change, the United States has demonstrated once again that it is the land of the freeloaders. Along with our pursuit of material wealth, nation-states and individual freedom are means by which we are about to commit suicide. We can’t deal with the responsibilities that come with freedom.

The saying ‘everyone for himself and God for us all’ reveals a profound truth about ourselves. Humans aren’t capable of solving their problems because of collective action problems and mass delusions. And we are better off with a single leader with unlimited authority. Ideally, this person is like a biblical good shepherd or Plato’s philosopher king. Even someone with a mediocre vision would do, as the wit of a single worm already vastly exceeds the collective wisdom of humankind.

If you like this story, you might want to see this video:

Collective Stupidity – How Can We Avoid It? Sabine Hossenfelder.

Featured image: Texel Rommelpot Tulips View West. Txllxt (2009). Wikimedia Commons. CC BY-SA 4.0.

Latest revision: 30 October 2025

1. Collective Stupidity – How Can We Avoid It? Sabine Hossenfelder. YouTube.
2. The Wisdom of Crowds. James Surowiecki (2004). Doubleday, Anchor.
3. Extraordinary Popular Delusions and the Madness of Crowds. Charles Mackay (1841). Richard Bentley, London.