The number of active US homebuyers fell to 966,752 in July, the lowest level on record, according to Redfin. Sellers outnumbered buyers by 51.3%, just short of December’s record gap, even though the seller pool shrank too, to 1,462,921, the fewest in a year. The gap widened for a simple reason. Buyers dropped out of the market far faster than sellers did, meaning the imbalance reflects collapsing demand rather than a flood of new listings. The a…