Capitalism

What it is:

Capitalism is an economic and social system in which participants privately own the means of production -- called capital. Free market competition, not a central government or regulating body, dictates production levels and prices. 

How it works/Example:

Under capitalism, prices and wages are determined by the forces of supply and demand.

Members of a capitalist economy are driven to obtain the maximum amount of utility ("benefit" or "profit") at the least cost. Privately owned industry caters to a consumer sector that wants goods and services of the highest value for the lowest price. Competition forces companies to keep prices low to attract consumers. The role of government in a capitalist society is to protect the legal rights of actors in the economy, not to regulate the free market system.

In capitalism, the most effective companies are those that create the greatest amount of utility. The most inefficient companies will be forced out of the market when the consumer discovers he can obtain the same goods for a lower cost elsewhere.

Why it Matters:

Capitalism characterizes the behavior of the global economy. Since the disintegration of the Soviet Union, capitalism has become the dominant economic system worldwide.

Capitalism is often considered the antithesis of Socialism -- an economic and political system where the ownership of capital (the means of production) is commonly owned. Socialist industry and production is regulated by the central government.

The Efficient Market hypothesis, an ideal of capitalism, states that finance market prices are always at the correct level at any given time considering all public information and expectations. Supporters of this theory believe that prices are necessarily always fair and correct. Dissidents believe that prices are often the result of random mistakes and misunderstandings and do not always represent the true value of a stock.

Through the ongoing balancing act of supply and demand, a capitalist economy is constantly striving to reach a level of long-term equilibrium where supply matches demand causing prices to stabilize. In the real world, political policy, natural weather events, consumer confidence and a whole host of other outside effects constantly affect the market, making the long-term equilibrium goal nearly impossible to achieve.

Best execution refers to the imperative that a broker, market maker, or other agent acting on behalf of an investor is obligated to execute the investor's order in a way that is most advantageous to the investor rather than the agent.