Do you know that in NYC (at least) you are not required to show your ID when voting? Due principally to undue burden on the voter, as I understand. And here you are suggesting that if you do not have a particular level of knowledge on certain subjects then you should not vote.

"...if you're relying only on your beliefs..."

Of course, I would argue the exact opposite. Between any number of subjective opinions, is it not ones beliefs that enable you to make a decision?

"If you've never taken a class or read a book on economics, please don't vote."

Perhaps you should not vote because i believe that you, Sir, are out of your mind.