11.
If the demand for a good is price elastic, a fall in its price will lead to:
(i) A rise in sales
(ii) A fall in sales
(iii) A rise in total expenditure on the good
(iv) A fall in total expenditure on the good

16.
A person is obliged to choose between buying a sewing-machine and a radio. He buys the radio. The opportunity cost of the radio may be said to be

17.
'Consumer-equilibrium' means

18.
Along an indifference curve, if the marginal rate of substitution is 3, then the consumer is willing to

19.
The long-run supply curve of a perfectly competitive firm