Basically, it's the idea that if you feed enough oats to a horse, eventually some of it will pass through for the sparrows to eat.

Sound familiar?

Yeah, this is what "Trickle down" used to be called.

http://www.newmainetimes.org/articles/2012/07/30/horses-and-sparrows-myth-trickle-down-economics/

So, basically, when Republicans are trying to sell 'Trickle down' as good for the middle class, they are actually telling the middle class to eat shit.