Click to get this free report NASDAQ-100 SHRS (QQQ): ETF Research Reports SPDR-SP 500 TR (SPY): ETF Research Reports To read this article on Zacks.com click here. Well, CPI gains can be attributed to many factors: strong economic growth, tightening labor markets, rising input costs due to tariffs, etc. In July, President Trump even asked the de facto leader of OPEC, Saudi Arabia, to increase its output, as low inventory put a toll on the pockets of U.S. consumers.