Zillow's price estimates are screwing up homebuying

Alvaro Dominguez for BI

When Zillow debuted in 2006, the fledgling site bore little resemblance to the real-estate behemoth it is now. There were no options to find an agent, get a mortgage, or request a tour — the search portal couldn't even tell you which homes were actually for sale. There was, however, the Zestimate: a "free, unbiased valuation" for 40 million houses around the US, based on a proprietary algorithm. Half the single-family homes in America suddenly had a dollar figure attached to them, and anyone could take a peek. Zillow's site crashed within hours as a million people raced to ogle at the results.