[kansface]

> But I think many people naturally wonder the value to society of getting rich by buying and selling things in a secondary market.

Obviously, buying and selling stuff in a secondary market is enormously beneficial to the people doing the buying and selling (or else they wouldn't be doing it)... For instance, if I start a business, I want to be able to sell it to Warren Buffet. When that doesn't happen, I want to be able to buy a slice of the businesses that he has invested in under the assumption that he does a pretty good job (as I don't have time/ability/money) to do that myself. Beyond personal utility, the value to society comes in the form of more businesses, more products, more services when its easier to buy and sell abstract ownership in businesses.

What counterfactual would get rid of Berkshire but keep YC?

[s1artibartfast]

I think your question conflates the primary and secondary markets. If you start a company and sell all or part to Buffet, that would be a primary market, and money goes into the company which can be used to grow. Same for YC. On the other hand, if you buy stock from another private investor, the company sees no money