Pyramid

To enlarge ones holding or interest in a series of operations on a continued rise or decline by using the profits to buy or sell additional amounts on a margin as where one buys on a 10 margin 100 shares of stock quoted at 100 holds it till it rises to 105 and then uses the paper profit to buy 50 shares more etc The series of operations constitutes a pyramid A similar process of reinvesting gains or winnings as of a gamble but not involving operation on margin is called a parlay