Stocks mostly returned to winning ways on Tuesday.
Further gains could be hampered by high valuations, especially for US stocks.
"I'm a little concerned that we're getting a little pricey, a little rich," Erin Gibbs, equity chief investment officer at S&P Global, told CNBC on Monday.
Nevertheless, Ari Wald, head of technical analysis at Oppenheimer, told CNBC on Monday that "the longer-term trend here is bullish for the S&P 500".
"So long as rates move up slowly, the Fed raises rates slowly, the bull market continues on," he said at a media briefing on Tuesday.