Le FMI lui-même a reconnu que la théorie du ruissellement était invalide...
"A 2015 paper by researchers for the International Monetary Fund argues that there is no trickle-down effect as the rich get richer :
[I]f
the income share of the top 20 percent (the rich) increases, then GDP
growth actually declines over the medium term, suggesting that the
benefits do not trickle down. In contrast, an increase in the income
share of the bottom 20 percent (the poor) is associated with higher GDP
growth.
"
Era Dabla-Norris ; Kalpana Kochhar ; Nujin Suphaphiphat ; Frantisek Ricka ; Evridiki Tsounta (June 15, 2015). Causes and Consequences of Income Inequality : A Global Perspective. International Monetary Fund. Retrieved June 25, 2015.