Nike Inc NKE.N forecast quarterly revenue below estimates as it expects to discount more. By Caroline Valetkevitch NEW YORK, July 8 (Reuters) - As U.S. companies open their books on the second quarter in the coming weeks, investors increasingly worried about a recession will be anxious to hear what executives say about how demand is holding up in the face of higher costs. Investors have been trying to to figure out whether an aggressive interest rate hike cycle by the U.S. Federal Reserve to tame inflation could tip the economy into recession.