" argued that in certain circumstances the theory of comparative advantage predicts that a rich country might be worse off by switching to a free trade regime with a poor nation."

The correct answer is Paul Samuelson

Paul Samuelson is one of the most influential economists of the 20th century, and his concept of “generalist” economics served directly to understand the complexities of macroeconomics. Paul is still known for being the first American to win the Nobel Prize in Economics, in 1970. One of Paul Samuelson's main contributions to the field was in structuring a new model to see the economy, since he used concepts that extrapolated the field of mathematics.

Samuelson was trained in physics and economics. One of the great merits of his work was at the junction of the two sciences when creating his theses. Most of Paul Samuelson's biography was linked to the academic field.

you would times this by how many days there are in a year 365*400=$146000

it should be d or b but i'm sure it's d