Home prices have always been negotiable. Usually, that has meant buyers pushing sellers below their asking price. But lately, in a nation marked by a record-low supply of homes for sale, the opposite has been happening.

Consider: half of U.S. homes sold for more than their list price during the four-week period ending May 16, according to Redfin. That marks a record high since 2012, when the brokerage began tracking.

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