Long-Run Profitability, Entry-Exit Dynamics & Barriers to Entry

Chapter Objectives & Big Picture

  • Understand how firms can remain profitable in the long-run, when entry & exit constantly reshape competition.

  • Core pillars of the chapter:

    • 15.1 Revenues, Costs & Economic Profit → measure true profitability (explicit + implicit costs).

    • 15.2 Free Entry & Exit in the Long-Run → forecast how competitive forces push price & profits toward zero.

    • 15.3 Barriers to Entry → strategic tools managers use to keep profits from being competed away.

  • Key real-world narrative: IBM’s rise and fall illustrates how dominant power can erode when hungry entrants (Apple, Microsoft, Dell, Google, Amazon) smell opportunity; likewise today’s leaders (Apple, Dell, Microsoft) face entrants of their own.

IBM, Dominance & Decline – A Motivating Story

  • 1940s–1960s: IBM = world’s most prestigious company; Nobel-winning R&D, fastest computers.

  • At peak, if IBM had split in two, each half would still have been the #1 valued firm on the U.S. exchange.

  • 1970s on: Entry of scrappy startups → Apple, Microsoft, Dell, etc.

  • Lesson: “Nobody ever got fired for buying IBM” became outdated; imperfectly competitive markets don’t let you stay on top without strategic defenses.

15.1 Revenues, Costs & Economic Profits

Accounting vs. Economic Profit

  • Accounting profit: Total Revenue−Explicit Financial Costs\text{Total Revenue} - \text{Explicit Financial Costs}

  • Economic profit: Total Revenue−Explicit Financial Costs−Implicit Opportunity Costs\text{Total Revenue} - \text{Explicit Financial Costs} - \text{Implicit Opportunity Costs}

  • Implicit costs include foregone wages, interest on personal funds, lost perks/benefits, lost job satisfaction, etc.

Startup Example (Baseline Numbers)

  • Forecast revenue: 500,000500{,}000/yr

  • Explicit costs: 400,000400{,}000/yr

    • Accounting profit = 100,000100{,}000

  • Implicit costs scenario: quit job (60,00060{,}000) + invest 100,000100{,}000 at 5 % (=5,0005{,}000)

    • Total implicit = 65,00065{,}000

    • Economic profit: 500,000−400,000−65,000=35,000500{,}000-400{,}000-65{,}000 = 35{,}000

    • Decision rule: launch if \piE > 0. Here “emphatically yes” because \piE = 35{,}000>0.

Opportunity-Cost Principle

  • Always ask: “Start this venture or what?” Compare to next-best alternative.

  • Entrepreneurs must “pay themselves” at least the value of their time & money.

Average Revenue, Average Cost & Profit Margin

  • Average Revenue (AR) = Revenue per unit = Price when single-price strategy.

  • Average Cost (AC) = Total CostQ\dfrac{\text{Total Cost}}{Q} (includes fixed + variable + implicit costs).

  • Profit margin/unit: Price−AC\text{Price} - \text{AC}.

  • U-shaped AC curve rationale:

    1. Spreading fixed costs → AC falls initially.

    2. Rising variable costs / diminishing marginal product → AC eventually rises.

  • Graphical profit test: If firm’s demand (AR) lies above AC at some Q, positive economic profit exists.

Short-Run vs Long-Run

  • Short-run: Fixed set of rivals & capacity; choose optimal quantity/price.

  • Long-run: Capacity can adjust; new firms enter, old exit; strategic capacity & market selection decisions dominate.

  • “How long is the long-run?” – industry specific (decade for refineries, minutes for lemonade stands, few years for tech).

15.2 Free Entry & Exit in the Long-Run

Rational Rules

  • Rule for Entry: Enter if \text{Price} > \text{AC} \;\Rightarrow\; \pi_E > 0.

  • Rule for Exit: Exit if \text{Price} < \text{AC} \;\Rightarrow\; \pi_E < 0.

Entry Effects

  • New suppliers → Firm-specific demand shifts left (market share loss) & becomes flatter (less market power, more elasticity).

  • Result: Lower price, lower Q, lower profit margin → profits fall.

Exit Effects

  • Departing rivals → Demand shifts right, curve becomes steeper (more inelastic) → higher price, higher Q, profitability recovers.

Equilibrium Tendency

  • With free entry & exit, long-run economic profits → 0.

  • Long-run price adjusts so P=ACP = AC.

  • Analogy: supermarket checkout lines—the shorter line attracts shoppers until all lines equalize.

Real-World Illustrations

  • Southwest Airlines: Even threat of Southwest entry cuts incumbent prices ≈ 30 %; threat alone yields ~⅔ of the discount of actual entry.

  • Supermarket food truck & surf spots: early “profits” (good deal or great waves) disappear as crowd (entry) grows.

  • U.S. churn data: ~7 M establishments; ≈9 % close & ≈9 % open yearly → constant creative destruction.

15.3 Barriers to Entry – Four Strategic Classes

1. Demand-Side (Customer Lock-in)
2. Supply-Side (Unique Cost Advantages)
3. Regulatory (Government Policy)
4. Deterrence (Scare Tactics / Signalling)
1. Demand-Side Lock-In

  • Switching Costs: iPhone -> Android: repurchase apps, transfer data, new chargers. Banks’ autopay, airlines’ frequent-flyer miles, tricky auto-renewals.

  • Goodwill & Reputation: Loyal patients to a doctor; trusted mechanics, plumbers.

  • Network Effects: Value rises with user base.

    • WhatsApp vs hypothetical “Whatsnot.”

    • Amazon reviews, Windows OS software ecosystem.

    • Automakers’ repair shop networks.

2. Supply-Side Cost Advantages

  • Learning-by-Doing: Cost down 20–30 % each time cumulative output doubles.

  • Economies of Scale / Mass Production: Etsy hand-sewn shirts vs H&M mass runs.

  • R&D for Process Innovation: Walmart logistics, Toyota production, Amazon AWS.

  • Supplier Relationships / Buying Power: Walmart secures lower wholesale prices.

  • Input Access Contracts: US Airways’ 32-yr gate lease; tech giants hiring/locking engineers; non-compete clauses.

3. Regulatory Barriers

  • Patents/Copyright/Trademarks: Monopoly on iPhone design, Merck’s Januvia, Coke secret recipe.

  • General Regulations: Licensing burdens (childcare, hospitals, cannabis, charter schools). Some countries: >3 months & >1 year’s income in fees to register a firm.

  • Scarce Compulsory Licenses: FCC radio spectrum.

  • Lobbying for Rules: Incumbents push regulation that raises entrants’ costs under guise of “public protection.”

4. Entry-Deterrent (Strategic Threats)

  • Excess Capacity: Over-build plant → signal ability to flood market; sunk costs commit firm to fight.

  • War Chests: Apple’s 194 billion194\text{ billion} cash scares rivals; survival in long price war.

  • Brand Proliferation: Cereal aisle mile-long; handful of firms fill every niche.

  • Reputation for Aggression: Amazon vs diapers.com – bots undercutting by up to 30 %, $100 M losses tolerated to kill rival → reputation deters future entrants.

Overcoming Barriers: The Tesla Case Study

Demand-Side Solution

  • Lacking gas-station network → Tesla subsidizes nationwide charging infrastructure; opens patents to rivals to accelerate network effects.

Supply-Side Moves

  • Partnered with Lotus for low-volume Roadster → fast launch & learning.

  • Learning-by-doing lowered battery & assembly costs → enabled Model 3 mass market.

Regulatory Strategy

  • Leveraged green policies: $465 M DOE loan; U.S. federal tax credit 7,5007{,}500 + up to 5,0005{,}000 state rebates; carpool lane access.

  • Negotiated $1.3 B subsidy package from Nevada for Gigafactory.

Deterrence / Financing

  • Musk’s personal wealth + Silicon Valley investors → sizable war chest; signals staying power against Detroit.

Ongoing Challenge

  • Success invites entrants: Rivian, Ford, GM, Stellantis now invest billions in EVs; Tesla must now defend its own incumbency.

Ethical, Philosophical & Policy Implications

  • Pro-Market vs Pro-Business: Healthy markets need entry; incumbents lobby for barriers -> tension between consumer welfare & corporate profits.

  • Creative destruction viewed as economic progress but painful for exiting firms & workers.

  • Debate: Should government allow large barriers (hands-off) or enforce antitrust, patent limits, occupational licensing reform?

Key Formulas & Numerical References

  • Accounting profit: π<em>A=TR−C</em>explicit\pi<em>A = TR - C</em>{explicit}

  • Economic profit: π<em>E=TR−C</em>explicit−Cimplicit\pi<em>E = TR - C</em>{explicit} - C_{implicit}

  • Implicit cost example: 60,000+0.05×100,000=65,00060{,}000 + 0.05\times100{,}000 = 65{,}000

  • Profit Margin (per unit): P−ACP - AC

  • Entry rule: Enter if P > AC

  • Exit rule: Exit if P < AC

  • Long-run equilibrium with free entry/exit: P=AC  ⇒  πE=0P = AC \;\Rightarrow\; \pi_E = 0

  • Learning curve heuristic: cost ↓ 20–30 % with each doubling of cumulative output.

  • Churn: ≈9 % of 7 M U.S. establishments close & ≈9 % open annually.

  • Amazon diaper price war: up to 30 % discounts, >$100 M short-run loss.

  • Apple cash hoard: 194 billion194\text{ billion} (mid-2021).

Rapid-Fire Summary (“Cheat Sheet”)

  • Measure profit economically, not just accounting.

  • Entry lowers incumbents’ demand & power; exit raises them.

  • Free entry & exit → long-run P=ACP=AC; economic profits trend to 0.

  • To keep profits, raise barriers: lock-in customers, cut unique costs, leverage regulation, or credibly threaten retaliation.

  • Barriers are strategic, not purely natural; entrants can sometimes overcome them (Tesla playbook).

  • Policymakers weigh fostering competition vs protecting incumbent jobs/profits.

  • As a manager: monitor looming entrants; as an entrepreneur: study & breach the barriers.