The demand for cash on Monday came from some players in the market who had taken big bets on the NDA government retaining power and on share prices rising thereafter. But the other guys won and the market fell. The punters essentially had to pay for their commitments and didn’t have the cash. They had to sell shares at whatever price they could find buyers to generate the cash. This drove prices further down, and to generate additional cash, they had to sell proportionately more stock, which in turn drove prices even further down. If the demand of cash is strong enough, it’s easy to see where this can go.