The engine of this economy — consumers — slowed in May. Consumer spending is responsible for more than two-thirds of gross domestic product in the U.S.

Consumer spending likely dropped last month, economists forecast, weighed down by a pullback in car purchases. Retail sales are seen dropping 0.6% from April, economists polled by The Wall Street Journal project.

Investors were closely watching monthly retail sales to see how consumers are responding to increased tariffs.