Technology, Production, and Costs

Lesson 9: Technology, Production, & Costs

• A firm’s technology refers to the processes it employs to convert inputs into outputs of goods and services.
  • This definition of technology is broader than the everyday understanding of the term.

Long Run vs. Short Run

• Short Run:
  • At least one of the firm’s inputs is fixed.
• Long Run:
  • The firm can vary all its inputs freely.

The Difference between Fixed Costs and Variable Inputs

• Fixed Inputs:
  • The total input quantity is fixed for a specified period.
  • Example: A coffee shop typically has one or two espresso machines, which cannot be quickly changed.
  • Other fixed inputs may include land, loans, and machinery.
• Variable Inputs:
  • The quantity of input can be changed easily at any time.
  • Example: A coffee shop that increases the production of lattes will require more beans, milk, and cups.
  • Other variable inputs include water, labor, and electricity.

The Difference between Fixed Costs and Variable Costs

• Total Fixed Costs (TFC):
  • Does not depend on the quantity of output produced.
  • Total Fixed Cost remains constant as the quantity produced increases.
• Total Variable Costs (TVC):
  • Depends on the quantity of output produced.
  • Total Variable Costs increase as the quantity of output increases.
• Total Cost (TC):
  • Total Cost is the sum of Total Fixed Costs and Total Variable Costs at each output level.
  • Formula: TC = TFC + TVC

The Difference Between Explicit Costs and Implicit Costs

• Explicit Costs:
  • Costs incurred by a firm when it spends money.
• Implicit Costs:
  • Non-monetary opportunity costs a firm experiences.

Marginal Product of Labor

• The marginal product of labor (MPL) measures the additional output produced by employing one additional unit of labor.
• Formula: MPL = rac{ ext{change in total output} }{ ext{change in labor} }

From the Production Function to the Cost Curves

• Knowing a company’s production capacity does not ensure that a firm should produce maximum output.
• It's crucial for firms to monitor input costs continuously.
• Having knowledge of both costs and revenues allows firms to identify the optimal production level that maximizes profits.

A Few More Types of Costs

• Average Fixed Costs (AFC):
  • Total fixed costs per unit of output produced.
  • Formula: AFC = rac{ TFC }{ Q }
• Average Variable Costs (AVC):
  • Total variable costs per unit of output produced.
  • Formula: AVC = rac{ TVC }{ Q }
• Average Total Cost (ATC):
  • Also known as average cost, represents total costs per unit of output produced.
  • Formula: ATC = rac{ TC }{ Q }

Average Total Cost Curve

• Increases in output yield two opposing effects on average total costs:
  • Spreading Effect:
  • As output increases, fixed costs are distributed over more units, resulting in decreasing average costs.
  • Diminishing Returns Effect:
  • As output increases, firms require more variable inputs, which contributes to rising average costs.

Economies of Scale

• Economies of Scale (Increasing Returns to Scale):
  • Long-run average total cost decreases as output increases.
• Constant Returns to Scale:
  • Long-run average total cost remains constant as output increases.
• Diseconomies of Scale (Decreasing Returns to Scale):
  • Long-run average total cost increases as output increases.

Characteristics of Perfect Competition

• Perfect competition involves more than simply having a couple of sellers in a market. It includes:
  • A large number of buyers and sellers, ensuring no single entity holds significant market share.
  • Selling identical goods or services (commodity products).
  • Ease for sellers to enter and exit the market without barriers.
• Perfect competition means firms and consumers are considered price takers.
  • No single firm can influence the market price, nor do they have motivation to charge less.

The Relationship Between Short-Run Costs & Profits

• In a scenario of price takers, revenue and profit can be computed as follows:
  • Revenue Formula:
  • ext{Revenue} = ext{Price} imes ext{Quantity}
  • Profits Formula:
  • ext{Profits} = ext{Revenue} - ext{Total Costs}
• Example data for Total Output, Total Revenue, Total Costs, and Total Profit:

• Marginal Revenue (P = MR):
  • Exists only in a perfectly competitive market.
• Marginal Costs:
• The Profit Maximization Principle states that the optimal quantity to produce is reached when marginal benefit equals marginal cost:
  • For firms, marginal benefit is revenue!
• Marginal Revenue Formula:
  • MR = rac{ ext{change in Total Revenue} }{ ext{Change in Output} }
  • Condition: MR ext{ must be greater than or equal to } MC

When is Production Profitable?

• Firms must account for both explicit and implicit costs to maximize economic profit.
• The decision to produce is based on price relative to minimum ATC:
  • If the firm produces where P > ATC , it makes a profit.
  • If the firm produces where P = ATC , it breaks even.
  • If the firm produces where P < ATC , it incurs losses.
• Profit Formula:
  • ext{Profit} = (P - ATC) imes Q
• The break-even price for a price-taking firm is the market price at which it earns zero profit.

A Profitable Perfectly Competitive Firm

• The firm is profitable when the price exceeds the minimum average total cost:
  • Per-Unit Profit Formula:
  • (P - ATC)
  • Total Profit:
  • (P - ATC) imes Q

A Perfectly Competitive Firm That Breaks Even

• The firm breaks even when price equals minimum ATC:
  • Per-Unit Profit:
  • (P - ATC) = 0
  • Total Profit:
  • (P - ATC) imes Q

An Unprofitable Perfectly Competitive Firm

• The firm is not profitable when price is less than minimum ATC:
  • Per-Unit Loss:
  • ATC - P
  • Total Loss:
  • (ATC - P) imes Q

Losses Don’t Necessarily Mean Immediate Shutdown

• Firms may opt to produce at a loss if they can cover variable costs and some fixed costs.
• Shut-Down Price:
  • The price at or below the minimum average variable cost.
• Examples of Adjusting to Loss:
  • Closing during night or slow days.
  • Selling products at a discount during the off-season.

The Supply Curve of a Firm in the Short Run

• A firm will produce at every price above minimum AVC when price intersects the MC curve.
• A firm will stop producing in the short run if the market price falls below the shut-down price.
• Therefore, the MC curve (above the shut-down price) constitutes the firm’s supply curve.

The Market Supply Curve in a Perfectly Competitive Industry

• The short-run industry supply curve illustrates how the quantity supplied by an industry is dependent on the market price (with a fixed number of producers).
• Higher prices incentivize more firms to supply an increased quantity.

Economic Profit Leads to Entry of New Firms

• If the price exceeds the break-even point (minimum ATC), firms are making profits.
• Such profits attract new firms, resulting in a rightward shift of the supply curve.

The Long-Run Market Equilibrium

• New firms will continue to enter the market as long as economic profits exist (when P > ext{min ATC} ).
• A market is in long-run equilibrium when the quantity supplied is equal to the quantity demanded, given that there has been sufficient time for industry entry and exit.

Perfect Competition and Efficiency

• Productive Efficiency:
  • Achieved when a product is manufactured at the lowest possible cost.
• Allocative Efficiency:
  • Occurs when firms produce goods and services that consumers value most, represented by the condition where marginal benefits equal marginal costs.

Zero Profit Periods

• Inquiry into why a firm may want to enter an industry if the market price is marginally higher than the break-even price explores the concept of economic profit as a crucial metric.

Lesson 11: Imperfect Competition

The Landscape of Firms

• Imperfect competition arises when companies compete while possessing market power.
• The spectrum of competition varies as follows:
  • Perfect competition → Monopolistic competition → Oligopoly → Monopoly

What a Monopolist Does

• A monopolist limits the quantity supplied to Qm and subsequently moves up the demand curve from point C to M, thereby increasing the price to Pm.
  • In contrast to perfect competition, a monopolist reduces output and elevates prices.

Where Do Monopolies Come From?

• In a perfectly competitive scenario, firms enter the market until no additional profits remain.
• Monopolists, however, benefit from barriers to entry, which allow them to sustain profits both in the short and long run:
  1. Government-created barriers.
  2. Control over scarce inputs.
  3. Network externalities.
  4. Economies of scale.

Government Created Barriers

• Such barriers enable firms to maintain temporary monopoly power to safeguard their innovations.
• Examples of government-created barriers include:
  • Patents that last for 16-20 years.
  • Copyrights that last for the author’s life plus 70 years.

Network Externalities

• A firm dominant in users is capable of controlling the market since its value hinges on the active participation of others.

Economies of Scale

• This phenomenon occurs when a firm’s long-run average cost decreases as output volume increases.

How a Monopolist Maximizes Profit

• Competitive firms lack the freedom to dictate prices, while imperfect competitors possess such a capacity.
• Marginal Revenue (MR):
  • Lies below the demand curve.
• An increment in production by a monopolist produces two opposing effects:
  1. Quantity Effect:
  • If one more unit is sold, it increases total revenue by the current selling price.
  1. Price Effect:
  • The monopolist must reduce the market price for all units sold to sell an additional unit, which diminishes total revenue.

Demand, Total Revenue, & Marginal Revenue

• Example data for price and quantity:

Profit Maximization for a Monopoly

• The process of profit maximization comprises two primary steps:
  1. Choosing an Output Level:
  • Determine quantity where MR = MC
  1. Choosing a Price:
  • Identify the highest price that consumers are willing to pay for that quantity.
  • Rule: Once quantity is selected, refer to the demand curve to ascertain how much consumers will pay for various quantities.

A Monopolist’s Profit-Maximizing Output & Price

• The price is determined by locating the point on the demand curve directly above the intersection at which MR = MC.

Monopolies Cause Inefficiencies

• The gain realized by monopolists is inferior to the loss incurred by consumers.

The Monopolist’s Profit with U-Shaped Cost Curves

• Provided the monopoly sustains robust barriers to entry, profit will endure:
  • Profit Formula:
  • ext{Profit} = (Pm - ATCm) imes Qm

Monopoly and Public Policy

• When a monopoly increases prices while reducing output, consumer surplus decreases, resulting in deadweight loss (DWL).
• To mitigate DWL, government policies aim to prevent monopolistic behavior, known as antitrust policies.
• Natural Monopolies:
  • Offer lower costs but don't guarantee that firms will choose to transfer cost savings onto consumers.

Average Total Cost for a Natural Monopoly

• A specific quantity of output is produced more efficiently by one large firm than by two or more smaller firms.
• Typically, natural monopolies are heavily regulated to prevent exorbitant pricing.

Two Common Government Solutions to Deal with a Natural Monopoly

1. Public (Government) Ownership:
   • Often leads to poor management outcomes.
2. Price Regulation:
   • Involves setting a price ceiling for monopolists, which can create shortages if high enough.

Unregulated vs. Regulated Natural Monopolies

• If a monopoly’s price is regulated at price Pr*, then consumer surplus increases while profits diminish.

The Landscape of Firms

• Again, imperfect competition is defined by firms competing while carrying market power.

Monopolistic Competition

• Monopolistic Competition:
  • A market structure that shares characteristics of both monopoly and perfect competition.
  • Features include:
  • Many competitors.
  • Similar but not identical products.
  • Absence of barriers to entry or exit in the long run.

Two Important Features of Monopolistic Competition

• Competition among sellers leads to reduced quantities sold per firm due to new firm entry.
• Having various choices enhances consumer satisfaction.

Short Run Profit Maximization

• The same profit maximization rule applies:
  1. Produce quantity where MR = MC
  2. Set price based on the demand curve.

Adjustments to Long-Run Equilibrium (Profit)

• The future influx of new entrants results in reduced customer base for original firms; Demand and MR shift leftward.
• As a result, economic profits decline to zero leading firms to break even and halting further entry.

Adjustments to Long-Run Equilibrium (Losses)

• The exit of firms results in a higher customer base for those remaining in the market; Demand and MR shift rightward.
• Consequently, economic profits stabilize at zero with remaining firms breaking even, leading to cessation of exits.

Is Monopolistic Competition Inefficient?

• Firms in monopolistically competitive industries often have excess capacity, meaning that producing more output would decrease average total costs.
• The price exceeds the marginal cost so that some mutually beneficial trades remain unexplored.