The Conference Board Leading Economic Index (LEI) for U.S. increased in September Christian Fernsby ▼ | October 23, 2020 The Conference Board Leading Economic Index(LEI) for the U.S. increased 0.7 percent in September to 107.2.Article continues below Topics: U.S. The Conference Board Coincident Economic Index (CEI) for the U.S. increased 0.2 percent in September to 101.7. ■