Optimal Margining and Margin Relief in Centrally Cleared Derivatives Markets Staff Working Paper 2014-29 Radoslav Raykov A major policy challenge posed by derivatives clearinghouses is that their collateral requirements can rise sharply in times of stress, reducing market liquidity and further exacerbating downturns. Content Type(s): Staff research, Staff working papers Topic(s): Economic models, Payment clearing and settlement systems JEL Code(s): G, G1, G19, G2, G21