What should I ask Patrick McKenzie?

I will be doing a Conversation with him.  Patrick is a phenomenon of the modern age.  He writes the excellent Bits About Money, which focuses on money, banking, payments, and more.

His blog is Kalzumeus.  He has lived most of his adult life in Japan, and has many excellent posts about Japan.  Here are his greatest hits on the blog.  He has run national shadow vaccine location information infrastructure.   On Twitter he is @patio11.

So what should I ask him?