U.S. businesses were much less likely to boost pay in the third quarter than in previous months, even as hiring remained healthy, a sign that wage gains may remain weak in the coming months.A quarterly survey by the National Association for Business Economics found that only 24 percent of companies increased wages and salaries in the July-September quarter. That’s down from 43 percent in the April-June quarter and the first drop after three straight increases. Yet the firms still added jobs at a healthy pace, which usually pushes wages higher as employers compete for workers. A measure of hiring in...