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Until 18-plus, T's and C supply, exchange fees and fair usage limits supply. Hello and welcome to the House of Cards edition of Slate Money, your weekly guide to the Business and Finance News of the week.

I'm Felix Salmon of Fusion in New York, and on the show this week we are going to revisit that

card trick that stumped a lot of our listeners a few weeks back and

we have recruited the best man in the world to help talk about it.

More on that in a minute.

We are also going to talk about Amazon's purchase of

Twitch for a billion dollars or so and Snapchat's 10 billion dollar valuation.

So many billions. We'll try and explain where all of those billions are coming from and finally

we'll chat about fan techs which is a company that lets you by quote, linked to the income of a pro-athlete brand.

What is exactly linked to the income of a pro-athlete brand?

It's some kind of security.

I'm not a big fan of this. We'll talk about that later, but before we get into the meat of the show, let me first introduce our very special guest, Emmanuel Derman. Now I actually quoted you Emmanuel a couple of weeks ago on this show

when I was talking about this card trick but I think I kind of got you a little bit

confused with Paul Wilmot.

So if you could give us a quick breakdown of like who you are and who Paul Wilmot is.

Okay, I'm happy to be here.

Paul, Paul and I, Paul is a quant and I'm a quant I think we were both fairly well known. I started out a bit before him but we first met in 1990. He runs a website called Wilmot.com.

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