Quote by Wassily Leontief
"Input and output are not abstractions; they are the material expressions of human labor."
More from Wassily Leontief
"Economics is the study of how societies organize the production and distribution of goods and services."
"Input-output analysis reveals the interdependence of all economic sectors."
"The structure of an economy can be represented as a system of linear equations."
"Understanding economic relationships requires mathematical precision."