Which of these are reasons for the intense increase in international trade that has occurred over the last 70 years?

answer; i believe the correct answer is (a) purchase of treasury stock;

the answer would be voluntary exchange -

"the act of buyers and sellers freely and willingly engaging in market transactions. moreover, transactions are made in such a way that both the buyer and the seller are better off after the exchange than before it occurred."

hope this : )

-shy