The angry mutterings at the Permian Basin Petroleum Association’s “Spring Swing” golf tournament this week weren’t all about missed putts or lost balls. The Texas oilmen on the fairways had a more serious concern: The president they helped elect was tanking oil prices.

Supply chain disruptions and policy decisions can significantly change these costs for oil companies — and consumers.

Oil prices climbed more than 4% on Wednesday, bouncing back from four-year lows earlier in the session, after U.S. President Donald Trump said he would further increase tariffs on China but pause the tariffs he announced last week for most other countries.