tariff - n. a tax on goods coming into or leaving a country
pursue - v. to move ahead with a policy or course of action
lock - v. to become fixed in one position
challenge - n. a difficult task or problem
automation - n. to run or operate something such as a factory by using machines, computers or robots instead of people to do the work
volatility - adv. likely to change in a very sudden or extreme way
vacuum - n. an empty space