Ready to trade? On budget-balanced efficient trade with uncertain arrival

This paper studies the design of efficient mechanisms for repeated bilateral trade in settings where (i) traders' values and costs evolve randomly with time, (ii) traders become ready available to participate mechanism at random times. Under a weak condition, analogous non-overlapping supports condition Myerson Satterthwaite (1983), is only feasible if runs an expected budget deficit. The smallest such deficit attainable by sequence static mechanisms.