The world economy "has stabilized somewhat" but resource constraints will linger, International Business Machines Corp. Chief Executive Samuel Palmisano said in a London speech to business and government leaders.

"Stimulus programs are making an impact, but they cannot and should not last forever," said Mr. Palmisano, according to a copy of the speech provided to The Wall Street Journal. "In fact, for the foreseeable future, we will be faced with addressing many pressing global issues with less, rather than more, resources."...