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Until 18-plus, T's and C supply, exchange fees and fair usage limits supply. Hello and welcome to the Feedback Loop 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 we have had an astonishing amount of awesome feedback from

you guys, mostly in the form of emails.

So we're going to spend a little bit of time going through some of those letters and responding to them.

And after that, we're going to talk about Cool kid tech companies and why they aren't using

investment bankers for their mergers and acquisitions.

Then we'll move on to Amazon's new local register payment system they call it.

It's going to be a full show, but first let me introduce our regular guest.

There's Kathy O'Neill, head of the lead program for data journalism at Columbia University.

Hi Felix.

Hello Kathy, and Slate's own Moneybox columnist Jordan Weisman.

Good to be here today.

I'm so happy that you're happy to be here.

Anyway, first and foremost, the mail bag.

I've been looking forward to this all week because we promised it last week and now I get to do it.

I have to say first that we got lots of mail about my thought experiment last week where I talked a bit about a magician doing a card trick

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