Two words about the tragedy of the commons and "Wealth of nations"

Contrary to common misconceptions, Smith did not assert that all self-interested labour necessarily benefits society, or that all public goods are produced through self-interested labour. His proposal is merely that in a free market, people usually tend to produce goods desired by their neighbours. The tragedy of the commons is an example where self-interest tends to bring an unwanted result.

"Between ten and fifteen years ago, before the boat fishery was entirely ruined, the price is said to have run from seventeen to twenty shillings the barrel. For these last five years, it has, at an average, been at twenty-five shillings the barrel. This high price, however, may have been owing to the real scarcity of the herrings upon the coast of Scotland." [1]

1. Wealth of nations.

Adam Smith

2. http://en.wikipedia.org/wiki/Invisible_hand