What's next: The rosy earnings season helped propel stocks to record highs, but some market watchers think the good times won't last. "I really think the big story 6 to 9 months from now is going to be the colossal decline in earnings growth," said Jim Paulsen, chief investment strategist at The Leuthold Group, a research firm.
Here are a few factors that might derail the corporate boom:
Waning tax cut benefit: Tax cuts automatically boost earnings, but it's much harder for them to boost earnings growth.
Rising rates: Consumer spending sent inflation to a six-year high, which makes more of a case for the Federal Reserve to continue its plan to raise interest rates. The luxurious years of low corporate borrowing costs might be coming to an end.
Tariffs: Fears of an escalation of the trade war were a common theme this quarter. Jack Daniel's maker Brown-Forman trimmed its earnings forecast for the year, thanks to the trade war. Retailers, too, are monitoring the situation closely.