Hufbauer and Lu, updating a landmark PIIE study made in 2005, calculate the payoff to the United States from trade expansion from 1950 to 2016 at $2.1 trillion. The payoff has stemmed from trade expansion resulting from policy liberalization and improved transportation and communications technology. The sum translates into an increase of $7,014 in GDP per capita and $18,131 in GDP per household. The potential gains from future policy liberalization could be as large as $540 billion for the United States by the year 2025, or an increase of $1,670 in GDP per capita and $4,400 in GDP per household. On the other hand, 156,250 manufacturing sector jobs were lost annually over the past 13 years, representing less than a percent of the number of people involuntary separated from their jobs each year. A more generous unemployment insurance program and expanded tax credits would help displaced workers adjust, the authors argue, while preserving the large gains resulting from trade expansion.
The data underlying this analysis are available here.