Inventory shortages that constrained home sales this spring are beginning to ease, with the number of homes listed for sale trending upwards in June, according to realtor.com data, The Wall Street Journal reports. The total number of listings rose by 4.3 percent from May to June, to 1.9 million homes. While that's down by 7.3 percent from the same time a year ago, inventory was off 18.6 percent year over year in February, the newspaper said. Real estate industry observers have speculated that home price gains might spur more homeowners to put their properties up for sale -- and for builders to break ground on more new homes. With the latest CoreLogic Home Price index showing a 12.2 percent year-over-year gain in home prices in May, the recent uptick in listings -- though bolstere...