If you’re looking for a great Q&A format (where anyone can ask the Q’s), there are few better places than a Reddit AMA. Everyone from Weird Al’s backup dancer to President Obama has turned out to provide answers.

Earlier this week, Edward Castronova took to the hot seat. An expert on “video game economies, virtual currency, and bitcoin” (according to his AMA title), Castronova has spent more than a decade studying the world of money in games. He’s literally written the book on the subject.

We’ve picked seven of Castronova’s AMA answers that we felt were essential reading. You can find the full AMA here.

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