KAJX

David Kestenbaum

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Now we have the story of information you get from your doctor as well as information you do not.

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The online furniture company Wayfair is now one of the most shorted stocks. Our Planet Money team talks to its CEO about what it's like to be running a company when some investors are betting on your fall.

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On January 1, 20 states raise their minimum wage and several states have additional increases planned in the coming months. Yesterday, we learned that Walmart will raise its base pay to $9 an hour this April.

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College textbooks are expensive. You probably already know this. A new biology or economics book can cost $300.

And prices have been soaring, doubling over the past decade, growing faster than the price of housing, cars, even health care.

But, surprisingly, the amount students actually spend on textbooks has not been rising. In fact, the best data we could find on this shows students have been spending a bit less over time.

The 1964 World's Fair showcased jet packs and new miracles of science. There was an entire house made of Formica. You could wipe it clean with a sponge!

The people who put the fair together tried to imagine how the future would look. Here are a few predictions, and how they actually turned out.

1. We had picture phones back then?

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An economic indicator commonly called the VIX, volatility index, is also known as the fear index. Whatever you call it, the index is hitting lows not seen since before the financial crisis.

The other day I went down to the little shop in the lobby of our building for a snack. I couldn't decide whether I wanted regular M&M's or Peanut Butter M&M's so I bought them both. On the way back upstairs to the office, I noticed something strange on the labels. Each had cost $1, but the pack of Peanut Butter M&M's was a very tiny bit lighter: 0.06 ounces lighter!

I wanted to know why, so I called a couple of experts and asked for their theories:

Theory No. 1: Peanut Butter M&M's are more expensive to make.

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And now, 4,000 years of economic growth in seven minutes. This story comes, of course, from our Planet Money team. David Kestenbaum and Jacob Goldstein bring us the history of light and how the world came what it is today.

A couple years ago, Adrienne McAdory read that the organization that sets the rules for Web addresses was going to allow people to apply for new top-level domains. No longer would there be just the old top-level domains like .com and .gov. People could apply for any new top-level domain they wanted.

McAdory liked the idea, but it took her awhile to figure out the right domain.

"I was thinking about lifestyle," says McAdory. "My girlfriends and I just had incessant conversations about 'Oh, we're not married, can't find the right guy, blah, blah, blah.'"

President Obama has called for increasing the minimum wage, saying it will help some of the poorest Americans. Opponents argue that a higher minimum wage will lead employers to cut jobs.

Figuring out the effect of raising the minimum wage is tough. Ideally you'd like to compare one universe where the minimum was raised against an alternate universe where it remained fixed.

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