Study Note on Competitive Markets

After reading this chapter, you should know:

How are prices determined in competitive markets?
How does competition affect the profits of a firm or industry?
What does society gain from market competition?
This chapter focuses on the behavior of competitive markets.

Definition: Market supply is defined as the total quantities of a good that sellers are willing and able to sell at alternative prices in a given time period, ceteris paribus (all other factors being equal).
Market Supply Curve: The market supply curve is derived from the sum of the marginal cost (MC) curves of all the firms within the market.
Determinants of Market Supply: The market supply of a competitive industry is influenced by the following factors:
- The price of factor inputs.
- Technology advancements.
- Market expectations.
- Taxes and subsidies imposed by the government.
- The number of firms operating within the industry.

Short-Run Supply Curve: The portion of the marginal cost curve that is situated above the average variable cost (AVC) is recognized as a competitive firm’s short-run supply curve.
Market Supply Determination: To ascertain the market supply, the quantities supplied at each price level by every firm (e.g., every farmer) are aggregated. For example, the total quantity supplied to the market at a price of $3 is 150 pounds per day.

Entry of Firms: When more firms enter an industry, the market supply curve experiences a rightward shift, which subsequently leads to a decrease in market prices.
Impact of Price Decline: If the market price dips below a firm's minimum average total cost (ATC), profits will vanish and losses incurred will prompt some firms to exit the industry.
Exit of Firms: When firms exit, this results in a leftward shift of the market supply curve, which helps stabilize prices and mitigate losses within the industry.

Tendency Towards Zero Profits: New firms are motivated to enter a competitive industry as long as profits exist. This influx causes market supply to increase, leading to the eventual elimination of economic profits. Once economic profit ceases, entry and exit operations stabilize.
Low Barriers to Entry: Barriers to entry such as patents or high capital costs hinder would-be producers from entering a market. In contrast, a lack of significant barriers allows new producers to capitalize on profitable industries, thereby driving down prices and profits.

Market Observations: A competitive market is often characterized by the following features:
- Presence of many firms.
- Products are identical or homogeneous.
- Perfect information available to all market participants.
- Marginal cost equals price (MC = Price).
- Low barriers to entry and exit.
- Resultant zero economic profit in the long run.

Microcomputers Example: Although few market segments are perfectly competitive, many operate similarly to competitive models. Firms in these markets continually threaten each other's prices and profits through enhancements in product quality and reductions in production costs.
Historical Development of the Computer Market: The market for microcomputers evolved rapidly; initially dominated by a few firms such as Apple, the lucrative nature of the industry led to the entry of over 250 firms between 1976 and 1983. The increase in competition resulted in lower prices and improved products, ultimately leading to the downfall of many firms unable to adapt.

Producer Objectives: Every producer aims to maximize profits by determining the optimal rate of output (where MC = Price).
Market Behavior Over Time: New firm entries suggested by economic profits shifted the market supply curve to the right. With economic profit vanishing, the long-run equilibrium occurs when no significant profits exist and ATC equals market price.

Table of Computer Revenues, Costs, and Profits:
- The profit-maximizing quantity observed was 600 computers monthly, where the marginal cost equaled the price of $1,000, resulting in monthly profits of $180,000.

Zero Economic Profit Scenario: A long-run equilibrium exists when economic profit is eliminated; however, this state is rarely achieved due to continuous innovations in products and production processes spurred by competitive dynamics.
Relentless Profit Squeeze: The flow of events in competitive markets generally follows:
- High prices and economic profits signal increased consumer demand.
- Profitable scenarios attract new suppliers, shifting the market supply curve rightward.
- A downward market price trend establishes a new equilibrium with increased output, and average costs minimalizing while economic profits align toward zero.

Apple iPod and iPad Dynamics: After the successful launch of the iPod, competitors entered the market, compelling Apple to enhance its product and reduce its prices.
- The price of the iPod fell by 40% within 2.5 years while experiencing substantial improvements in quality.
- The iPad experienced similar competitive pressures with significant sales and consequent price reductions to maintain market share.
AirPods Market Dynamics: Launched in 2016, AirPods initially profitable faced competitive pressures leading to price and product quality adjustments. The production cost was approximately $59-$69, sold at $159 until market saturation occurred with competitive entries, potentially driving prices down towards $29.