85.
The breakeven-point is defined as occurring at an output rate at which

86.
Consider the following statements-
1. The increasing returns to scale imply that the marginal product of a variable factor will always increase.
2. The constant returns to scale imply that the marginal product of a variable factor will always diminish
3. Managerial diseconomies constitute an important cause of decreasing returns to scale
Which of these statements is/are correct?

87.
The backward-bending supply curve for labour exists

90.
Match the following.
List-I List-II
a. Science of wealth 1. Marshall
b. Science of welfare 2. Samuelson
c. Science dealing with scarcity 3. Robbins
d. Science of growth 4. Smith