Some people have an obligation to sell (option contracts must be honored, ETFs must be rebalanced, etc.) and this creates liquidity. Some people also have a lo

Some people have an obligation to sell (option contracts must be honored, ETFs must be rebalanced, etc.) and this creates liquidity. Some people also have a lower risk tolerance (or want the money to put into something with more predictable returns like say treasuries) and want out now.