Question 1

What determines a firm's short-run supply curve in perfect competition?

Accepted Answer

In perfect competition, a firm's short-run supply curve aligns with the segment of its marginal cost curve that exceeds the minimum average variable cost. This segment represents the quantities the firm will supply at different prices. The firm only produces when market price covers at least the average variable cost per unit, ensuring it avoids losses.

Question 2

Why do firms stop production at the shutdown point?

Accepted Answer

The shutdown point occurs at the minimum average variable cost. Below this price, a rational firm produces zero output because revenue cannot cover variable production costs, leading to greater losses than shutting down. At or above this price, the firm continues operating since it can at least recover its variable costs.

Question 3

How do input price changes affect a firm's supply curve?

Accepted Answer

Changes in input prices shift the marginal cost curve, which directly affects the supply curve. When input prices rise, the marginal cost curve shifts upward, reducing the profit-maximizing quantity at each price. Conversely, decreasing input prices shift the marginal cost curve downward, increasing the quantity supplied at each price level.

Question 4

What is the relationship between marginal cost and supply decisions?

Accepted Answer

A firm's supply decision is guided by comparing marginal cost to market price. The firm produces additional units as long as marginal cost remains below the market price, maximizing profit. The portion of the marginal cost curve above minimum average variable cost serves as the firm's supply curve, indicating optimal quantities at different prices.

Question 5

How does a perfectly competitive firm determine its production quantity?

Accepted Answer

A perfectly competitive firm determines production quantity by equating marginal cost to market price. Since the firm is a price taker, it accepts the market price and produces the quantity where marginal cost equals that price. This approach maximizes profit while ensuring the firm operates only when price exceeds minimum average variable cost.

Question 6

What role does average variable cost play in production decisions?

Accepted Answer

Average variable cost establishes the minimum price threshold for production. A firm only produces when market price exceeds or equals minimum average variable cost, ensuring revenue covers the cost of producing each unit. Below this threshold, the firm shuts down to minimize losses, making average variable cost the critical decision point.

Question 7

How does a bakery's supply curve change when wheat flour prices increase?

Accepted Answer

When wheat flour prices rise, production costs increase, shifting the bakery's marginal cost curve upward. This upward shift reduces the profit-maximizing quantity at each price level, effectively shifting the supply curve leftward. The bakery supplies fewer loaves at the same market price, reflecting higher production costs.

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