What should I ask Joel Mokyr?

Yes, I will be doing a Conversation with him.  He is of course one of this last year’s Nobel Laureates in economics, here is previous MR coverage of him.  Here is Wikipedia.

He has a recent book Two Paths to Prosperity: Culture and Institutions in Europe and China, 1000-2000, co-authored with Avner Greif and Guido Tabellini.

So what should I ask him?