(Table: Variable Costs for Lawns) Look at the table Variable Costs for Lawns. During
the summer, Alex runs a lawn-mowing service, and lawn-mowing is a perfectly
competitive industry. Assume that costs are constant in each interval; that is, the
variable cost of mowing 1 through 10 lawns is $100. His only fixed cost is $1,000 for
the mower. His variable costs include fuel, his time, and mower parts. If the price for
mowing a lawn is $70, how much is Alex’s total cost at the profit-maximizing output?
A) $3,500
B) $2,800
C) $2,100
D) $1,500
The demand curve for videos has shifted to the right. What could have caused it?
A) a fall in the price of videos
B) an increase in the price of videos
C) an increase in the supply of videos
D) an increase in the incomes of buyers