How much should you pay for a used iPhone, TV, or bicycle? Spark Capital, Andreessen Horowitz, SV Angel and more think you need to know, so they’ve invested $1.5 million into Priceonomics, a Y Combinator winter 2012 startup. The seed round that shall be announced later today (Update: here it is) will go towards hiring front-end developers and back-end engineers to make the site beautiful but simple and beef up its machine learning technology.

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