Mark Cuban said companies are already bracing for Donald Trump's tariff proposals.Borja B. Hojas/Getty ImagesMark Cuban has criticized Donald Trump's tariff proposals.In a Threads post on Friday, he said companies are already bracing for impact.Many economists say the tariffs will be inflationary as costs are passed down to consumers.Mark Cuban is raising the alarm again on President-elect Donald Trump's tariff proposals.In a Threads post on Friday, Cuban said companies are already bracing for potential tariffs on Chinese imports by shoring up inventory.