“In the last quarter-century, U.S. exports have grown from $448.16

billion to $1.55 trillion…In that time, the United States has gone from having 86 export categories valued at more than $1 billion in value to having 248 above $1 billion, the final tally for 2017. We have gone from having six of the roughly 1,265 export categories above $10 billion in 1993 to 22 today.”

What is the economic theory related to the above quote?

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