#900710
In the United States since 1960, what has happened to the percentage of the total production of goods and services that is exported and to the percentage of the total purchases of goods and services that is imported?
Варианты ответа:
  • they have remained roughly constant
  • the percentages are now about half as much as they were in 1960
  • the percentages are about twice as much as they were in 1960
  • the percentages are about thrice as much as they were in 1960