China’s threat to impose duties on U.S. oil imports will hit a business that has soared in the last two years, and which is now worth almost $1 billion per month. In an escalating spat over the United States’ trade deficit with most of its major trading partners, including China, U.S. President Donald Trump said last week he was pushing ahead with hefty tariffs on $50 billion of Chinese imports, starting on July 6. China said Friday it would retaliate by slapping duties on several American commodities, including oil. Investors expect the spat to come at the expense of U.S. oil firms, pulling down the share prices of ExxonMobil and Chevron by 1 to 2 percent since Friday, while U.S. crude oil […]