Tjalling Koopmans, Dutch-American mathematician and economist Nobel Prize laureate (died 1985)

Tjalling Charles Koopmans was a Dutch-American mathematician and economist. He was the joint winner with Leonid Kantorovich of the 1975 Nobel Memorial Prize in Economic Sciences for his work on the theory of the optimum allocation of resources. Koopmans showed that on the basis of certain efficiency criteria, it is possible to make important deductions concerning optimum price systems.

The Nobel Memorial Prize in Economic Sciences, officially the Sveriges Riksbank Prize in Economic Sciences in Memory of Alfred Nobel, commonly referred to as the Nobel Prize in Economics, is an award in the field of economic sciences administered by the Nobel Foundation, established in 1968 by Sveriges Riksbank to celebrate its 300th anniversary and in memory of Alfred Nobel.