Were the Cullens Rich?

In Twilight, the Cullens are insanely rich, owning multiple luxury cars and homes, but exactly how much money do they have and how did they get it?

How much money did the Cullens have?

Cullen, age 370, has accumulated a fortune of $34.1 billion — much of it from long-term investments made with the aid of his adopted daughter Alice, who picks stocks based on her ability to see into the future.

How is the Cullen family so rich?

Carlisle Cullen earned his wealth through compound interest and several shrewd long-term investments with significant help from Alice, whose precognitive abilities allowed the family to predict changes in the stock market and invest accordingly.