I don't see the connection to zero-sum. You can have nepotism in non-zero-sum games too. That might describe the traditional practice of handing down a trade to

I don't see the connection to zero-sum. You can have nepotism in non-zero-sum games too. That might describe the traditional practice of handing down a trade to the next generation, where the bakers and blacksmiths trained their kids to do it and they took over the business when the old man retired. Maybe people only complain when the nepotism is in a zero-sum context, where someone else is losing.