In his empirical tests, Wassily Leontief used an input-output table to ?

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In his empirical tests, Wassily Leontief used an input-output table to ?

A. calculate the capital and labor required to produce $1 million of U.S exports and imports
B. calculate the labor productivity of America workers relative to foreign workers
C. calculate the capital productivity of American capital relative to foreign capital
D. All of the above