Microeconomic Principles: Consumer and Producer Surplus & Market Structures

A comprehensive set of flashcards covering key concepts on consumer and producer surplus, market structures, and efficiency in microeconomics.

Consumer Surplus

The difference between what a consumer is willing to pay for a good and what the consumer actually pays.

Producer Surplus

The difference between the actual price a producer receives and the minimum price they would accept.

Equilibrium Price

The price at which the quantity of goods supplied equals the quantity of goods demanded.

Marginal Revenue (MR)

The additional revenue gained from selling one more unit of a good.

Marginal Cost (MC)

The additional cost incurred from producing one more unit of a good.

Allocative Efficiency

Producing the mix of goods most desired by society where Price (P) equals Marginal Cost (MC).

Productive Efficiency

Producing in the least costly way where Price (P) equals minimum Average Total Cost (ATC).

Barriers to Entry

Factors that prevent new firms from entering a market, such as economies of scale, legal barriers (patterns/licenses), and control of essential resources.

Economic Effects and Price Discrimination: Inefficiency

Monopolies are generally less efficient than competitive markets, often resulting in economic transfer from consumers to owners and X-inefficiency (operating at higher than minimum cost).

Economic Effects and Price Discrimination: Price Discrimination

Charging different prices to different buyers for the same product.

Ex: business vs. leisure travel, movie theater matinees

Conditions: Requires monopoly power, markets segregation, in the inability of buyers to resell the product.

Normal Profit

Occurs in the long run when Price (P) = minimum Average Total Cost (ATC); considered a zero economic profit.

Economic Profit

Occurs when Price (P) is greater than Average Total Cost (ATC).

Shut Down Rule

A guideline stating that a firm should continue to operate in the short run if Price is greater than or equal to the minimum Average Variable Cost (AVC).

Pure/Perfect Copetition

Very large number of firms, standardized products, no control over price (price takers), and very easy entry/exit.

Monopolistic Competition

Many firms, differentiated products, some price control, and relatively easy entry.

Oligopoly

A few large firms, standardized or differentiated products, limited price control due to mutual interdependence, and significant entry obstacles.

Pure Monopoly

One firm, unique product with no close substitutes, considerable price control (price maker), and blocked entry.

Demand Curve

For an individual firm, the demand curve is perfectly elastic ( a horizontal line) because they must accept the market price. However, the market demand curve is like a regular downward sloping demand curve.

Deadweight loss

The loss of total economic welfare that occurs when a market is not operating at maximum efficiency due to distortion like taxes, subsidies, price controls, or market power.

Equality Rule

In pure competition, Price (P) = Marginal Revenue (MR) = Average Revenue (AR).

Profit Maximization & Loss Minimization

• A) the MR = MC Rule: Firms maximize profit or minimize loss by producing where Marginal Revenue equals Marginal Cost.

• B) Maximize the difference between Total Revenue and Total Cost.

Stay Open vs. Shut Down

• Produce: If Price is greater than or equal to the minimum Average Variable Cost (AVC).

• Shut Down: If Price falls below the minimum AVC, the firm minimizes losses by closing.

Why is the individual firm in pure competition a “price taker” while the monopolist is a “price maker”?

Perfect composition are price takers because they must accept the market price as given. This is due to the presence of numerous firms selling identical products; no single firm can influence the market price.

Monopolist are price makers because it has the ability to set its own price, as it is the only seller of a unique product with no close substitutes.

Explain how entry and exit in a purely competitive industry lead to zero economic profit in the long run.

When demand increases, existing firms may earn economic profit, prompting new firms to enter the market. This entry increases supply, leading to a decrease in market price until it reaches the zero-profit level. Conversely, when firms face losses, they may exit the market, reducing supply and causing prices to rise. This process continues until the market reaches a long-run equilibrium where all firms are earning zero economic profits.

Monopolist Demand Curve

Downward sloping and represents the entire market demand.

Revenue Rule

For a monopolist, Marginal Revenue is always less than Price (MR < P).

Output and Price Determination

• 1. Find the quantity where MR = MC

• 2. Use the demand curve to find the highest price consumers will pay for that quantity.

• Pricing Misconceptions: Monopolists do not charge the highest possible price, nor are they guaranteed profits; they can still suffer losses if cost exceed demand.

Compare the efficiency outcomes (Productive and Allocative) of a purely competitive market versus a monopoly. Why is monopoly considered inefficient compared to pure competition? Explain both the price/output effect in the deadweight loss effect.

In a purely competitive market the efficiency outcome of Productive and Allocative is achieved. For Productive, they produce the minimum point on the ATC curve meaning they use the least amount of resources to produce a given level of output. Then for Allocative, P=NC so resources are allocated in a way that reflect consumer preferences. Monoplys do not usually achieve Productive or Allocative efficiency. Monopoly’s don’t face competitive pressure, so they often don’t produce at the minimum ATC. Additionally, monopolist restrict output and charge high prices so P > MC.

Monopoly’s are considered inefficient because they underproduce overprice their product compared to pure competition.