Which 1954 research on U.S. trade patterns revealed that American exports were more labor-intensive than imports, despite the U.S. being recognized as a capital-rich country?

Explanation

The 1954 study conducted by Paul Samuelson analyzed U.S. trade data and found that U.S. exports were surprisingly labor-intensive compared to imports, challenging the expectation given the country's capital abundance. Other economists listed did not conduct this particular study.