47) Karl Marx famous book Das capital's first volume was released on which year?

48) When did 'The Communist Manifesto', the book by Marx and Engels was released?

49) Fredrich list nationality is_________

50) An economist on explaining the concept of money framed a phrase 'a temporary about off purchasing power'. Mention the economist

51) Name the economist who proposed the 'Time preference theory of interest'

52) The term 'Quasi-rent' was initially used by _________

53) Consumers goods are called as consumption capital by

54) In economics the concept 'Elasticity of demand' was introduced by _________

55) AFC (Average Fixed Curve)'s shape is _____________

56) 'Choice of technique' is the book written by __________