Policy makers and market participants alike wish to understand the amount, economic significance, and concentration of derivatives trading activity. This paper suggests that systematic measuring and reporting of margin by market participants, disaggregated by asset class, would provide more...

Using asset prices I estimate the marginal value of capital in a dynamic stochastic economy under general assumptions about technology and preferences. The state-space measure of marginal q relies on the joint measurability of the value function, i.e. firm market value, and its underlying firm...