Prof. J. Linderberg, Aarhus University, added the following facts :

One more small thing : Koopmans has not recieved a Nobel Prize, there is no Nobel Prize in economic science. The prize was initiated by the National Bank of Sweden in an attempt, apparently successful, to score publicity in conjunction with the ceremony for the Prizes defined by Alfred Nobel. The Royal Swedish Academy of Science makes the distinction on its webpage, but journalists and media do not, they have no reverence for Nobel's memory and legacy. The Swedish labor government which was behind the new prize succeeded in getting a free ride on the tails of a world event, much to my dismay. (I am a Danish citizen since thirty years but I still get upset by Swedish politics.)