if we insist on everybody getting the same share, no matter what, then the smart one doesnt have incentive to make progress and the lazy one simply stops trying. that'd be disaster (isnt that communism?)
the good gene is like a natural lottery. do you insist your neighbor to share his lottery money with you because he does nothing to get that money? because he's lucky, he may share with you 10%, but never share 50-50
Actually you'll find there are cultures around the globe where you are expected to share more than 50% if you receive a windfall... The less than 50% thing is very much a western world phenomenon; and a US one in particular.
You'll find that gift cultures exist today that have long since stopped being agrarian; the Philippines and Thailand come to mind. In the big cities the gift culture is still alive and well. It is quite a different culture to the predominately protestant individualistic society that is America though.[0]
