Efficiency in output requires which of the following?

Suppose the bobby pin industry is perfectly competitive. The price of a packet of bobby pins is $2.00. Pins and Needles, Inc is a firm in this industry and is producing 1,000 packets of bobby pins per day at the point where the MC = MR

The average cost of production at this output level is $1.50 per packet. a. What is the marginal cost of the 1,000th packet? b. Is this firm making an economic profit, zero economic profit, or an economic loss? How much? c. Is the firm in long-run equilibrium? Why or why not?

What is the difference between aggregate expenditure and consumption spending?

What will be an ideal response?