The market portfolio is in one sense the least important portfolio to provide to investors. In an J-agent one-period stochastic endowment economy, where preferences are quadratic, a social-welfare-minded contract designer would never create a contract that would allow trading the market...

[...]We address several questions in this paper. First,how could macro markets be useful to the average person?Second, how large are the potential benefits from diversificationif these markets were to be introduced andused optimally? Third, can existing financial marketsachieve a similar degree...