62.
Which two of the following statements are correct?
I. In the short - run, ∆TFC = 0, therefore ∆TC = ∆TVC
II. If decrease in AFC < increase in AVC, then AC decreases
III. If decrease in AFC = increase in AVC, AC remains constant
IV. If decrease in AFC > increase in AVC, then AC increases
Choose the correct answer from the options given below

63.
A market demand schedule for a product indicates that

65.
Assertion (A) The quantity of a commodity demanded invariably changes inversely to changes in its price.
Reason (R) The price effect is the net result of the positive substitution effect and negative income effect.

66.
Which of the following statement is true?

67.
Which of the following is correct in regards to imperfect competition?

68.
The increasing returns to scale can be explained in terms of

69.
In the short run, the supply curve of a competitive firm is