This paper studies security markets with trading frictions, and offers a complete characterization of viable convex cost systems. For frictional markets that give rise to a convex-cone traded-payoff span and a sublinear payoff cost functional, the following three conditions are equivalent:...

This study examines the evolution of transitory volatility over the week for NYSE/AMEX stocks. We treat the block of five trading days during a week as a single trading session and control for disproportionate rates of information arrival over the week by comparing variances of weekly returns...