Studies argue that monetary policy has an impact on bonds and stock liquidity only during the financial crisis. Others argue that monetary policy has an impact on the liquidity during a high economic volatility period relative to a stable period. These studies are not comprehensive enough to provide a big picture of the relationship between monetary policy and these two financial markets. I am speculating that in addition to the financial crisis, economic recession alters the effect of monetary policy on the bond and stock liquidity. So, how we do model this? How we do disentangle the effects of the financial/economic crisis?