Hey, just a very short show for you. We are on the road. We are right now in my hotel room in Louisville, Kentucky.

But we do want to get to at least one of your questions.

And the question we have comes from Jack, a listener in Australia.

He wants to know how much money is there in the world.

If you add up all the bills and coins in the world, what's the total?

Joining us to help answer this question is someone who knows all about this.

It's Austin Goolsbee, perhaps the scariest former member of the Obama administration.

Scary in name only.

He's actually a really nice guy.

He is left Obama's administration. He's now a professor at University of Chicago. So Austin, this is a pretty big question, right?

Yeah, big question, and Jack probably doesn't realize it but he's weighed in an old

religious debate in the field of economics because it all comes back to what do you mean by money.

So the easiest thing to understand is just literal currency, bills and coins and economists call that M0. If you just add up all

the money in circulation of bills and coins for the world is about...

You know what we should do we should actually before Austin gives us the answer we should

stop and ask people to guess.

What's your name?

Stanley. If you had to guess how What's your name? Stanley.

If you had to guess how much money there was in the whole world, if you took all the money and

gathered it up, added together, put it one of those coin machines at the grocery store.

How much money would there be in the world?

I was going to give it a window maybe 75 to 125 trillion.

...