The fact that it’s extremely specialised equipment that’s needed to make the chips of which there is a limited supply due to there being basically only one manufacturer of lithography capable of making chips at the nanometer level that is required, and the factories that produce chips are extremely complicated to make. And you can’t just make more machinery to make the chips because they require rare earth materials, China controls most of the global market for rare earth minerals and because of Trump they’re rationing them.