DAVOS, Switzerland—Economic growth will remain robust over the coming year, sustained by pro-business policies around the world, a possible surge in investment and bullishness about major economies such as China and India, according to chief executives gathered at the World Economic Forum.

Corporate leaders gathered in Davos on Tuesday saw relatively few threats to a rare moment of synchronized economic expansion among the world’s major economies, with many crediting the administration of President Donald Trump for the bullishness.

“There is extreme optimism,” said Sir Martin Sorrell, chief executive of ad group WPP PLC. “It is remarkable the psychological difference—whatever you think of Trump—that he has brought…It has improved (executives’) already very positive psychology.”

Chief executives at the Wall Street Journal’s CEO Council lunch in Davos said the U.S. tax reform has provided a major boost to sentiment. If U.S. companies respond to the reform by repatriating profits stashed overseas and then investing at home, the expansion could continue for some time, they said.

Roger Crandall, chairman and CEO of Massachusetts Mutual Life Insurance Co., or MassMutual, underscored the change in regulatory conditions under Mr. Trump, calling it a huge plus for U.S. business.