Trickle down economics? The IMF found if income share of top 20 percent increases, GDP declines over medium term. Conversely, if bottom 20 percent increases,

Trickle down economics? The IMF found if income share of top 20 percent increases, GDP declines over medium term. Conversely, if bottom 20 percent increases, GDP goes up. It makes sense - rich people invest their money, which may or may not drive economy. Poor people spend, which absolutely drives economy.