The huge amount that comes from capital gains got me thinking... why is the return on capital, versus say the return on labor, so high? Our society is awash with capital. We apparently have more of it than we know what to do with (see, e.g., the real estate bubble, the tech bubble). If the capital markets were efficient, shouldn't supply and demand equilibrate things to drive down the price of capital?<p>I think the structure of the capital markets, VC's and funds and the like, are still holding back efficiency by limiting the market of sellers. Things like Kickstarter that "democratize" the capital markets may also play a huge role in making them more efficient.