61.
When was Adam Smith's major work "An enquiry into the Nature and Causes of Wealth of Nations" published?

62.
The standard of living of workers depends upon their

63.
Which of the following is example of external economies of scale?

64.
TC curve

65.
"The real price of everything, what every thing really costs to the man who wants to require it, is the toil and trouble of acquiring it. Who made this statement?

66.
As for the cost of production of an individual farmer, the rent paid by him

67.
Human wants are

68.
TVC curve

69.
"Rent is a creation of value, not of wealth". Who made this observation?

70.
These are kinds of rent EXCEPT