This trend goes back far further than that, to be honest. For centuries in the western world's middle and upper class, the first born son inherited the family a

This trend goes back far further than that, to be honest. For centuries in the western world's middle and upper class, the first born son inherited the family assets, the second born sons went into the priesthood and any other sons got an allowance and travelled the world to make their own way of things because there were no opportunities for them at home.