Proving that profit is economically and morally justifiable, rather than the result of exploitation, has been a central preoccupation of neoclassical economists.

With joint-stock corporations, investors can place bets on the success of many different companies, without having to play a central management role in any one of them. This allows investors to diversify their financial holdings. It also allows them to capture profits on their investments, without having to get involved in the dirty, troublesome business of actually running a company.

If you want poor people to work you restore their incentive by giving them less, such as by cutting social services. If you want rich people to work you restore their incentive by giving them more, such as by cutting taxes.

Indeed, if communist central planners could have organized the economy with as much detail, precision, and flexibility as a modern-day Toyota or Wal-Mart, communism would probably still exist.

Economics is a social science, not a physical science.

One of the glaring failures of capitalism is the continuing widespread existence of poverty - often extreme poverty. Even in the advanced economies, many millions of people endure terrible economic and social deprivation, despite the incredible wealth all around them.

This relationship is the foundation for the argument, made by some trade unionists and labour advocates, that high wages can actually be "good for business". The precedent set by Henry Ford in 1914, who offered workers $5.00 per day (a very high wage at the time) so they could afford to buy the same cars they made, is often invoked.