Riddle Me This

I received the following riddle in an email from a friend. You're supposed to forward the email to 10 people in order to receive the answer. I didn't do that, but I think I have the answer anyway! See if you can figure it out....

Paul Harvey RIDDLE: (When asked this riddle, 80% of kindergaren kids got the answer, compared to 17% of Stanford University seniors.)

"What is greater than God, more evil than the devil, the poor have it, the rich need it, and if you eat it, you'll die?"