A firm under monopolistic competition will earn

If the demand curve is QD = 100 – 10P and there is a $1 price increase, then the elasticity of demand at P = 2 is

2. If the absolute value of a demand elasticity is less than 1, then

3. If the cross-price elasticity is negative, then the two goods are

4. Under perfect competition, a firm maximizes its profit by setting

5. In a large city, a good, real-world example for perfect competition would be

6. A firm under monopolistic competition will earn