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PART VIII — ECONOMICS🔵 Intermediate

Why Do Some Industries Have Far More Competition Than Others?

Market Structures

From perfect competition to monopoly — the degree of competition determines pricing power, economic profit, and equity valuation multiples.

economicsmonopolycompetitionoligopolypricing powermoat

Live Result

$0.50

ƒ: (price - marginal_cost) / priceraw: 0.500000

ƒ(x)

Use variable names from the panel above (e.g. FV, r, n) — or type numbers directly: 10000 / (1 + 0.08)^10

price

Market price of the good ($)

price = 80

marginal_cost

Cost to produce one additional unit ($)

marginal_cost = 40

average_total_cost

Total cost divided by quantity ($)

average_total_cost = 50

quantity

Units produced and sold

quantity = 1000

💡 You can also enter values directly in the formula: 10000 / (1 + 0.08)^10

⬇ Export Calculation

Exports a plain .txt file with your expression, formula, all variable values, result, and educational notes — ready to paste into any report, Word doc, Notion, or Google Docs.

The exported file includes the formula in standard mathematical notation — you can paste it directly into Excel, Google Sheets, or back into FinanceSheep.

📖

Learn: Market Structures

PART VIII — ECONOMICS · Educational Guide

The Core Idea

Not all markets are equal. Corn farmers like Jake take whatever the world price is — they have zero pricing power. Microsoft sets its own price for Windows with virtually no competition. The market structure determines how much pricing power a firm holds, how much profit it can sustain, and ultimately what multiple investors pay for its equity.

How It Works

Four structures on a spectrum: Perfect Competition (many sellers, identical product, zero economic profit long-run, e.g. farming) → Monopolistic Competition (many sellers, differentiated product, e.g. restaurants) → Oligopoly (few sellers, interdependent, e.g. airlines) → Monopoly (one seller, full pricing power, e.g. patented drug). The Lerner Index = (P − MC)/P measures market power: 0 = perfectly competitive, 1 = pure monopoly.

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Real-World Example: Jake's farm: price = $6.00/bu, MC ≈ $5.90/bu. Lerner = (6.00−5.90)/6.00 = 0.017 — essentially zero market power (perfect competition). Pharmaceutical company with patented drug: price = $500, MC = $10. Lerner = (500−10)/500 = 0.98 — near-monopoly. Economic profit = ($80 − $50) × 1,000 = $30,000 for a firm with some pricing power. In perfect competition, economic profit → $0 long-run as new firms enter.

Why Do Some Industries Have Far More Competition Than Others?

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