81.
For the success of the penetration price policy, which one of the following is not desirable?

83.
When the economist speaks of an increase in demand, he is usually referring to a

84.
A perfectly competitive firm cannot earn super normal profit or incur losses in the long run due to which of the following reasons?

85.
For most consumers apples and oranges are substitute goods. Therefore, we would expect a rise in the price of apples to lead to

87.
The law of diminishing returns depend on the assumption that