“Let's consider first Hayek's claim that prices in free market capitalism do not give people what they morally deserve. Hayek's deepest economic insight was that the basic function of free market prices is informational. Free market prices send signals to producers as to where their products are most in demand (and to consumers as to the opportunity costs of their options). They reflect the sum total of the inherently dispersed information about the supply and demand of millions of distinct individuals for each product. Free market prices give us our only access to this information, and then only in aggregate form. This is why centralized economic planning is doomed to failure: there is no way to collect individualized supply and demand information in a single mind or planning agency, to use as a basis for setting prices. Free markets alone can effectively respond to this information.
It's a short step from this core insight about prices to their failure to track any coherent notion of moral desert. Claims of desert are essentially backward-looking. They aim to reward people for virtuous conduct that they undertook in the past. Free market prices are essentially forward-looking. Current prices send signals to producers as to where the demand is now, not where the demand was when individual producers decided on their production plans. Capitalism is an inherently dynamic economic system. It responds rapidly to changes in tastes, to new sources of supply, to new substitutes for old products. This is one of capitalism's great virtues. But this responsiveness leads to volatile prices. Consequently, capitalism is constantly pulling the rug out from underneath even the most thoughtful, foresightful, and prudent production plans of individual agents. However virtuous they were, by whatever standard of virtue one can name, individuals cannot count on their virtue being rewarded in the free market. For the function of the market isn't to reward people for past good behavior. It's to direct them toward producing for current demand, regardless of what they did in the past.
This isn't to say that virtue makes no difference to what returns one may expect for one's productive contributions. The exercise of prudence and foresight in laying out one's production and investment plans, and diligence in carrying them out, generally improves one's odds. But sheer dumb luck is also, ineradicably, a prominent factor determining free market returns. And nobody deserves what comes to them by sheer luck.”

How Not to Complain About Taxes (III): "I deserve my pretax income" http://left2right.typepad.com/main/2005/01/how_not_to_comp_1.html (January 26, 2005)