What type of demand curve do firms in perfect competition face?

Question

BlackTom AI · Accepted Answer

Firms in perfect competition are price takers, so the individual firm’s demand curve is a horizontal line at the market price — i.e., perfectly elastic.

1) Relevant knowledge points and concepts
- Perfect competition assumptions: many sellers, identical products, free entry/exit, and buyers/sellers are price takers.
- Price taker: a single firm cannot influence the market price; it can sell any quantity at the market price but none at a higher price.
- Demand elasticity: perfectly elastic demand means elasticity → ∞; any infinitesimal price increase reduces quantity demanded to zero.

2) Step‑by‑step reasoning
- The market determines a single equilibrium price P*. Each individual firm faces that price; it cannot charge more because buyers would buy from other identical firms.
- Therefore the firm’s perceived demand for its output at each possible price is: Q > 0 only if P = P*, and Q = 0 if P > P*. Equivalently, at P* the firm can sell any feasible quantity demanded at that price.

3) Calculations / intermediate steps (elasticity argument)
- Price elasticity of demand = %ΔQ / %ΔP. If the firm raises price by an infinitesimal amount (ΔP → 0+), the quantity demanded from that firm falls from Q to 0 (ΔQ = −Q). Thus %ΔQ approaches −100% while %ΔP → 0+, making the ratio → −∞ in absolute value, indicating perfectly elastic demand.

4) Why the correct answer is correct
- A horizontal demand curve at the market price means the firm faces a perfectly elastic demand: it can sell any quantity at P* but none at any higher price. This is the hallmark of perfect competition.

5) Why other options are incorrect
- a. Vertical: vertical (perfectly inelastic) implies quantity fixed regardless of price — not true for price‑taking firms.
- b. Upward sloping: demand never slopes upward in standard theory; buyers buy less at higher prices.
- d. Downward sloping: a downward‑sloping demand applies to the whole market or a monopolist, not an individual firm in perfect competition.

6) Conclusion
The firm in perfect competition faces a perfectly elastic demand curve, matching answer c. Perfectly elastic (c) is correct.

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