Caterpillar Inc CAT.N reversed course to fall 3.3%. By Sagarika Jaisinghani July 30 (Reuters) - The Nasdaq and S&P 500 indexes fell on Friday following a glum quarterly earnings report from Amazon.com, while data showing a strong rise in June consumer spending reinforced optimism about a steady economic rebound. Hopes of a steady post-pandemic rebound in the U.S. economy have lifted Wall Street's main indexes to record highs and put the benchmark S&P 500 .SPX on course for its sixth straight monthly gain, but the rapid spread of the Delta variant and rising inflation have kept sentiment in check.