The question asks about a necessary assumption of the perfect competition model concerning the entry and exit of firms. Understanding the core characteristics of perfect competition is key to identifying the correct assumption.
C) Firms can freely enter or exit the industry, with no significant barriers in either direction. This is a defining characteristic of a perfectly competitive market. The absence of barriers to entry ensures that if existing firms are making supernormal profits, new firms will enter, increasing supply and driving prices down until only normal profits are earned. Similarly, the absence of barriers to exit means that if firms are incurring losses, they can leave the market, reducing supply and allowing remaining firms to return to normal profits.
The question asks about the assumption of 'perfect knowledge' in a perfectly competitive market. We need to identify what this assumption implies for both buyers and sellers regarding market information.
Correct Option: C) Have complete and accurate information about prices, quality, and availability of the product
This option directly aligns with the definition of 'perfect knowledge' in a perfectly competitive market. Both buyers and sellers are assumed to possess full and accurate information regarding all aspects of the product and market conditions. This includes prices, quality, and availability, ensuring rational decision-making and preventing any information asymmetry.
The question asks why a firm in perfect competition is called a 'price taker'. This concept is fundamental to understanding the characteristics of a perfectly competitive market structure. We need to recall the key features of perfect competition to determine the correct reason.
D) It must accept the price determined by overall market demand and supply, and cannot influence it through its own actions. This accurately describes why a firm in perfect competition is a price taker. The market, through the interaction of all buyers and sellers, determines the equilibrium price, and individual firms must adhere to it.
The question asks about the shape of the demand curve faced by an individual firm operating under perfect competition. Understanding the characteristics of perfect competition is key to determining this.
A) A horizontal (perfectly elastic) straight line at the prevailing market price. This is correct because, under perfect competition, an individual firm is a price taker and faces a perfectly elastic demand curve. It can sell any quantity at the market price, but none above it.
This question asks about the relationship between average revenue (AR) and marginal revenue (MR) for a firm operating in a perfectly competitive market. Understanding the characteristics of perfect competition is key to answering this.
Characteristics of Perfect Competition: In a perfectly competitive market, there are many buyers and sellers, homogeneous products, free entry and exit, and perfect information. Crucially, individual firms are price takers, meaning they have no power to influence the market price. They must accept the price determined by overall market supply and demand.
Price as Constant: Since a perfectly competitive firm is a price taker, it can sell any quantity of its output at the prevailing market price. This means the price per unit remains constant regardless of the quantity sold by an individual firm.
Average Revenue (AR): Average revenue is the revenue per unit of output sold. It is calculated as total revenue (TR) divided by the quantity (Q).
\[ AR = \frac{TR}{Q} = \frac{P \times Q}{Q} = P \]Thus, for a perfectly competitive firm, AR is always equal to the market price (P).
Marginal Revenue (MR): Marginal revenue is the additional revenue generated from selling one more unit of output. It is calculated as the change in total revenue divided by the change in quantity.
\[ MR = \frac{\Delta TR}{\Delta Q} \]Since the price (P) is constant for a perfectly competitive firm, each additional unit sold adds exactly the market price to the total revenue. For example, if the price is $10, selling the first unit adds $10, selling the second unit adds another $10, and so on.
Relationship between AR and MR: Because the price is constant, both AR and MR will be equal to that constant market price. If a firm sells an additional unit at the same constant price, the average revenue remains unchanged, and the marginal revenue is exactly that price.
\[ AR = MR = P \]Correct Option: A) AR equals MR, and both are equal to the constant market price
This statement accurately describes the revenue relationships for a perfectly competitive firm. Since the firm is a price taker, it faces a perfectly elastic demand curve at the market price. Therefore, each additional unit sold brings in revenue equal to the market price, making MR equal to P. Similarly, average revenue is also equal to P.
This question asks about the possible outcomes for a firm operating under perfect competition in the short run. We need to understand how the relationship between market price and the firm's average cost determines its profit or loss.
B) Supernormal profit, normal profit, or losses, depending on whether price exceeds, equals, or falls short of average cost — This option accurately describes the range of possible outcomes for a perfectly competitive firm in the short run. The firm's profit or loss is directly determined by the relationship between the market price and its average total cost.