When it comes to negotiating power, it’s better to be a home seller in the Bay Area and a buyer in Philadelphia. Zillow’s spring analysis of buyers’ and sellers’ markets across the U.S. looked at how long homes spend on the market, how likely they are to have had a price cut and how much they sold for in relation to their listing price.The nation’s top sellers’ markets are the big West Coast tech centers in San Jose, San Francisco and Seattle. Less competitive markets where buyers have time to negotiate are in the East and Midwest, including Philadelphia, Chicago...