Wall Street edges higher as investors gird for earnings

Investors are next looking for cues from the first-quarter earnings season, set to begin in earnest with Alcoa's report after the bell on Monday. Ahead of the results, Alcoa shares were up 4 percent. Profits at S&P 500 companies are expected to have fallen 7.7 percent in the first quarter, according to Thomson Reuters I/B/E/S.