4 Min Read WASHINGTON (Reuters) - A measure of U.S. services industry activity increased to a record high in May amid robust demand as the economy moves toward fully reopening, but businesses are struggling to source raw materials and labor, driving up production costs. A customer service agent waits for customers at a Delta Airlines check-in counter at Washington's Reagan National airport as the novel coronavirus (COVID-19) pandemic continues to keep airline travel at minimal levels and the U.S. economy contracts in the first quarter at its sharpest pace since the Great Recession, in Washington, U.S. April 29, 2020. REUTERS/Kevin Lamarque