Slate Money is brought to you by Casper, an online retailer of premium mattresses for a fraction of the price.

Casper mattresses come with free delivery and returns within a 100-day period.

And get $50 towards any mattress purchased by visiting casper.com slash slate money and using the promo code slate money and by carbonite

protect your photos music and documents with automatic cloud backup from carbonite try it free

without a credit card at carbonite.com and use the offer code slate to get two free bonus months if you decide to buy.

And by Mile IQ. If you're one of the 60 million Americans who drive for work, then you know

that your miles are your dollars. Mile IQ is the only mileage tracker app that detects, logs,

and calculates your miles for you, ensuring that every mile

is accounted for and no dollar is lost. Try Mile IQ for free today by texting Slate Money to

31996. That's Slate Money to 31996.

Music Slate Money to 31996.

Hello, and welcome to the Professional Identity Edition of Slate Money, your guide to the Business and finance news of the week.

I'm Felix Salmon of Fusion.

I'm joined, as always, by Kathy O'Neill, the data scientist and blogger at mathbabe.org.

Hello.

Hello, Kathy.

And in a fit of very good news for all listeners out there, Jordan Weissman has transmogrified into Stacey Vanek-Smith.

Hi, Stacey.

Hi, Felix.

Who are you, Stacey?

I am a correspondent for Planet Money on NPR.

You, so this is excellent.

...