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Trickle down is a political term. Economists know that wealth trickles up. It is only moved back down with taxes. Non-economists have a saying for this, “the rich get richer”. Economists have a formula for this: r > g
And inheritance is one of the biggest source of inequalities hence why Piketty proposes a massive tax on inheritance to be redistributed equally as a universel basic inheritance to young people. There are hard core scientific papers behind it but this is a popularized article I have found: https://goodmenproject.com/featured-content/fairer-taxes-and-inheritance-for-all-the-economic-plans-of-star-economist-piketty/. Problem is inheritance is an extremely touchy topic, most people have the deeply rooted instinct to give everything to there children and can't think rationally about it.
Pickle down Rickonomics
High capacity pump up, and a trickle down.