The marginal product of an input factor initially rises with its employment level and then, after a certain level of employment, it starts falling. this is known as:

The set of all possible combinations of the two inputs that yield the same maximum possible level of output is known as...........

With the change in one variable input, keeping the factors constant, if the Marginal Physical Product is positive, the Total Physical Product will be----------

In long run as long as average cost is falling, marginal cost must be less than the .......

In the long run __________.

Which one of the following leads to the law of variable proportions?

When a proportional increase in all inputs results in an increase in output by the half proportion, then the production function is said to display which returns to scale?