 Strictly speaking, John Nash didnt win the Nobel Prize because  there isnt a prize for Economics or Mathematics. (Alfred Nobel who  willed his estate to the Nobel foundation saw no need for a prize in  mathematics.) In 1969 the Swedish Central Bank established the "The  Sveriges Riksbank Prize in Economic Sciences in Memory of Alfred  Nobel". This prize is presented in the same ceremony and is  therefore often mistaken for a proper Nobel Prize. It is even often  referred to as the "Nobel Prize in Economics" in daily conversation.