Caterpillar Inc CAT.N reversed course to fall 3.8%. By Sagarika Jaisinghani July 30 (Reuters) - Wall Street's main 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 put the benchmark index .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.