Copyright 2014 NPR. To see more, visit DAVID GREENE, HOST: OK, what you're about to hear might make you think very differently next time you park your car. And maybe that's something you're about to do while you're listening to the radio right now. There is research suggesting that the way we park might have implications for our country's economic productivity. NPR's Social Science correspondent Shankar Vedantam joins us each week on this program to talk about things like this.Shankar, welcome back.SHANKAR VEDANTAM, BYLINE: Hi, David.GREENE: All right, Shankar, so draw this together for me - parking your car and the implications it would have for economic productivity.VEDANTAM: I'm going to try, David, but in order to do that I need to go back and give you some context into one of the most famous psychology experiments ever conducted; it's called Marshmallow Test. In its simplest form, you bring a kid into a room and you offer her a treat, like a marshmallow. And you tell the kid, if
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