Free Trade for New American Jobs
Foreign competition means lower prices and more sales, both for the foreign companies and for the more efficient American companies that can meet the competition. American buyers pay less, so have more money to spend on other goods and services, creating new American jobs. Foreign workers and companies have more income, so can purchase American stuff, creating still more new American jobs.
Many economists argue that high tariffs led to the world-wide depression of the 1930s.