71.
A consumer is in equilibrium when marginal utilities are

72.
TC curve

73.
In which year, was the first volume of Das Capital by Karl Marx published?

74.
According to Keynes, interest is a payment for

75.
According to Keynes, interest is a payment for

76.
When marginal is negative, it must be true that

77.
All the following curves are U-shaped except

78.
The Critique of Political Economy, the first fruits of Karl Marx's long painstaking research at the British Museum, appeared in

79.
Interest is paid because

80.
The term 'marginal' in economics means