“Economists don’t like tariffs not only because of the tariff itself but because of the uncertainty it creates,” Fangzhou Jiang, a Chinese student at Harvard Kennedy School and co-founder of higher education consulting firm Crimson Education, tells TIME. “It’s the same situation.” The uncertainty Jiang is dealing with is his education: while his student visa has so far not been affected, the changing situation around Harvard’s enrollment authorization and now new restrictions on Chinese