Dmitry Sevastapilo is the FT's US-China correspondent. He says China may be putting pressure on American companies in China to retaliate for some of the tough economic measures that the Biden administration has taken against Chinese companies. South Korean companies are very, very important in the chip market in China and if Samsung and SK Hynix play ball with the Americans, it helps them a lot. Inflation in Iran has become kind of a mystery. The country's statistics agency hasn't published new data in two months. This fuels accusations that the government is hiding evidence showing that prices have spiraled to record levels.