Stock indexes staggered to big losses in rising volume Friday, capping an ugly week. The S&P 500 dropped 1.6%, while the Nasdaq and IBD 50 fell 1.2% each. Volume rose across the board. The price-and-volume action constituted distribution, a footprint of fund selling. The Nasdaq added two distribution days to its count because a provisional stalling day on Nov. 21 was brought into the count.