The fast food industry is an example. The initial investment is usually high. Prices tend to be close to the same. Examples include breakfast cereal, beer, automobiles, and soft drinks. In the U.S. laws prohibit the creation of monopolies, but do permit approved monopolies such as public utilities.
New legislation is likely to result in fewer, larger utilities and lower prices.
There are interferences to the free exchange of goods and services among countries. This results in surpluses in some countries and shortages in others. Capitalism brought prosperity to the U.S. and much of the world, but it brought inequality as well. When countries introduced capitalist principles, inequality increased dramatically, causing national and world tension. Government entities also take a large share of total national output and reallocate it to create more equality.