How is wealth created?

Some family wealth created can be retained for many generations.

 and some family through the efforts of several generations no less accumulated considerable wealth.

What is with the ancestors accumulated wealth easily create new wealth, or the individual's ability and opportunity to more easily create new wealth?

What is the production process to create more wealth, or the process of exchange and distribution of more wealth creation?

Is this an era of wealth creation by inheritance?

Turmoil and peace, which are more opportunities for the creation of new wealth？