147. In the short run if a perfectly competitive firm finds itself operating at a loss, it will

Reduce the size of its plant to lower fixed costs
Raise the price of its product
Shut down
Continue to operate as long as it covers its variable cost
✅ The correct answer is D.
In the short run if a perfectly competitive firm finds itself operating at a loss, it will continue to operate as long as it covers its variable cost.

148. The slope of indifference curve indicates

Price ratio between two commodities
Marginal rate of substitution
Factor substitution
Level of indifference
✅ The correct answer is B.
The slope of indifference curve indicates Marginal rate of substitution. The marginal rate of substitution (MRS) is the amount of a good that a consumer is willing to give up for another good, as long as the new good is equally satisfying.

150. Profit is maximum when

Slope of MC and Mr is the same
Slope of TC and TR is the same
Slope of AC and AR is the same
None of the above
✅ The correct answer is B.
Profit is maximum when Slope of TC and TR is the same. To obtain the profit maximizing output quantity, we start by recognizing that profit is equal to total revenue (TR) minus total cost (TC).