U.S. stocks were set to open lower Tuesday, as investors shift focus back to the economy, and await auto sales and factory orders.
On Monday, U.S. stocks finished slightly lower, as investors reversed from their initial positive reaction to news that Osama bin Laden had been killed.
April was the strongest month for stocks since December.

Economy: The Commerce Department releases data on March factory orders at 14:00 GMT, with economists looking for a 2.5% rise, compared with February's 0.1% decline.
Investors will also get monthly auto sales figures from the major car makers.
Companies: Dow component Pfizer (PFE, Fortune 500) reported earnings per share that beat by a penny but revenue was just in line with forecasts. And the drugmaker reaffirmed its outlook but investors were hoping for more. Shares fell about 1% in premarket trading.
Sears Holdings (SHLD, Fortune 500) issued a disappointing outlook late Monday. Shares fell nearly 5% in premarket trading.
Other companies reporting on Tuesday include credit card processor MasterCard (MA, Fortune 500), media company CBS (CBS, Fortune 500), and food processor Archer Daniels Midland Co (ADM, Fortune 500).