Hillary will make a better president than any current republican candidate. Hell, Gumby would make a better president than any current republican candidate. : )
Not sure if there ever was a study, but I do know there is a generally accepted theory that businesses rarely survive a hand down. Maybe folks who build a successful business are too busy doing that to raise kids capable of taking over. Or maybe the ability to run a successful business is both rare and uninherited.
In the book, Myth of the Robber Barrons, a small study of 40 families from 1880 to 1920 showed that 75% of prominent families in Scranton failed to have a line of succession to the next generation. The conclusion is "an inheritance can be trasnferred ... but vision, talent, and drive were hard to transfer from generation to generation." Use the arrow to open in new window and magnify, or go to this link: https://books.google.com/books?id=ENt9hjxmaEQC&pg=PA57&lpg=PA57&dq=myth+of+the+robber+barons+an+inheritance+can+be+transferred;+but&source=bl&ots=SWhyvLdXlD&sig=jmQ65ysKjaqOpMNVkvKuNe_Vi0g&hl=en&sa=X&ei=FzVRVZSBB8XUoATE24DABw&ved=0CB4Q6AEwAA#v=onepage&q=myth of the robber barons an inheritance can be transferred; but&f=false