Not tax money, but the availability of education. This is not 1860 -- there is too much to assimilate before you can "build a better mousetrap." I don't see private charity creating an all-inclusive educational system the way state and federal governments have. The Catholic Church did a fantastic job of that once, but there is no equivalent in today's society, and I have the feeling our morally untainted benefactors at Cato aren't going to foot the bill.
But for that matter, state funding was always a big driver even back in those halcyon days that "boot strappers" harken back to. A lot of the golden age of private capital was created by seed money (or graft) from big government projects, because the government is typically the only institution with any incentive to think long-term, even if they rarely exercise it. The rugged individualism of our past is as much a sepia-toned crock as John Wayne's old west (itself built on federal agriculture and railroad grants).
Oh man, that is such a bad example for you, since tenancy in the Middle Ages depended on the Manorial System dominated by large local landowners who were able to abuse their tenants precisely because there was no strong government protector of their rights -- the original "trickle down" system. And indeed every hesitant step towards securing peasant rights has been met with the same dire predictions that if you curtail the total freedom of the wealthy the economic health of the country will be doomed.
If the "conservative" argument had won the day, there would never have been an independent merchant class, a bourgeois small capital ownership class, or the unseating of rents in favor of investment as the major driver of wealth. Adjustment to change is a fact of survival -- you can't go back to the robber barons, even if they actually were what the Randians mistakenly masturbate to.