Investors are also looking to Wednesday when the Federal Reserve ends a two-day meeting where policy makers will discuss when to raise an important interest rate that has been held near zero for more than six years. After its March meeting, the Fed opened the door to a rate increase this year by no longer saying it would be “patient” in starting to raise its benchmark rate.

The government will release its estimate of economic growth in the January-March quarter. Gross domestic product is expected to have risen 1 percent, down from 2.2 percent in the previous quarter.

The rise in American stocks Monday morning followed gains in European markets that built toward their close. Investors were encouraged by news that Greece had reshuffled its team that is negotiating a bailout, raising hopes that it can avert a default.

Some see the shake-up as a way to reduce the clout of the Greek finance minister, Yanis Varoufakis, who has been criticized for failing to put together a list of changes that Greece’s European creditors want before they release new loans. Greece’s government is expected to run out of money to pay its bills in a few weeks.

The Greek stock index rallied on the news, closing up 4.4 percent. France’s CAC-40 index rose 1.3 percent and Germany’s DAX jumped 1.9 percent.