A natural monopoly occurs when:
a. long-run average costs decline continuously through the range of demand.
b. a firm owns or controls some resource essential to production.
c. long-run average costs rise continuously as output is increased.
d. economies of scale are obtained at relatively low levels of output.
The correct answer and explanation is :
The correct answer is a. long-run average costs decline continuously through the range of demand.
Explanation:
A natural monopoly occurs when a single firm can produce the entire market supply at a lower cost than multiple firms would. This typically happens due to the presence of significant economies of scale. Here’s why option a is correct:
- Long-run average costs decline continuously through the range of demand:
- In a natural monopoly, the firm’s long-run average cost (LRAC) curve continuously declines as output increases. This means that the firm’s cost per unit decreases as it produces more.
- When a firm’s LRAC curve is downward-sloping, it suggests that increasing the scale of production leads to cost advantages, making it more efficient for a single firm to serve the market rather than having multiple firms competing. This is particularly common in industries with high fixed costs and low marginal costs, such as utilities (water, electricity) or railroads, where the infrastructure investment is high but the cost of serving each additional consumer is relatively low.
- Why other options are incorrect:
- b. A firm owns or controls some resource essential to production: This describes a resource monopoly, where a firm has exclusive control over a key input required for production. While this can lead to monopoly power, it’s not necessarily a natural monopoly.
- c. Long-run average costs rise continuously as output is increased: This describes a situation where the firm is experiencing diseconomies of scale, meaning that as output increases, costs per unit rise. This is not characteristic of a natural monopoly.
- d. Economies of scale are obtained at relatively low levels of output: Natural monopolies typically require large-scale production to achieve cost efficiencies, so they do not emerge when economies of scale are realized at low output levels.
In summary, a natural monopoly occurs in industries where economies of scale persist over a large range of demand, allowing one firm to provide goods or services more efficiently than multiple firms could.