Market Structure & Competitive Dynamics

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Abstractions about how market structure and competitive strategy shape prices and welfare, covering oligopoly and monopoly power (Bertrand and Edgeworth paradoxes, Lerner index, monopsony), surplus measures (consumer, producer, social surplus), and product-strategy pathologies like feature creep and bundling.

31 abstractions in this family — domain-specific abstractions that sit near one another in structural-signature space (k-means over structural-signature embeddings). Each is shown with its short description.

• Alchian–Allen Effect — A common absolute per-unit charge compresses the price ratio of high- to low-grade goods and can, under specified choice conditions, shift the mix toward higher quality.
• Amoroso–Robinson Relation — Relate marginal revenue to a selling price and the signed own-price elasticity of demand along a differentiable price–quantity schedule.
• Average variable cost — Variable production cost divided by quantity of output, used in the firm's shutdown decision.
• Bertrand competition — A strategic market model in which firms choose prices while buyers select quantities at the offered prices.
• Bertrand Paradox (Economics) — Compute the extreme corner of price competition — two firms selling an identical good at equal marginal cost price at marginal cost with zero profit — as a deliberately-wrong baseline whose gap to real margins becomes a five-assumption diagnostic audit.
• Bundling — A seller conditions access to one good on accepting another by offering a combined package, extracting more surplus when component valuations are dispersed and negatively correlated — or leveraging market power in one good to foreclose rivals in a complementary one.
• Business Model Canvas — Osterwalder's nine-block single-page template that renders a venture's operating logic all at once — segments, value, channels, revenue, resources, activities, partners, costs — so its components and their interdependencies become simultaneously visible and testable as hypotheses.
• Channel Conflict — The distribution failure mode in which a producer's new direct pathway to customers undercuts the margins its own intermediaries depend on, triggering rational retaliation that erodes the expected gain — so a new channel's true worth is gross gain minus incumbent-channel loss.
• Cobweb Model — The economic model of self-sustaining price-quantity oscillation in markets with a rigid production lag, where producers commit output on today's price and discover it clears at another — tracing a cobweb spiral whose stability follows from the supply-to-demand slope ratio.
• Consumer Surplus — The aggregate welfare buyers gain by paying a market price below what each would have been willing to pay, measured as the area between the demand curve and the price line — giving voluntary exchange's buyer-side value a monetary magnitude for welfare analysis.
• Contestable Market — Diagnose market power from entry conditions rather than firm count — where entry and exit are costless, the mere credible threat of hit-and-run entry disciplines even a monopolist to competitive pricing, so the binding variable is sunk cost, not concentration.
• Demand Shaping — The supply-chain practice of applying pricing, promotion, substitution, and channel levers to the consumer side of a capacity mismatch — moving realized demand toward feasible supply rather than scaling supply to meet it — by steering the marginal consumer's selection.
• Double Marginalization — Explain why a chain of firms each holding pricing power ends up charging more and selling less than a single integrated firm would, because each node adds its markup while ignoring the demand-shrinking externality that markup imposes on the other node's profit base.
• Edgeworth Paradox — Show that Bertrand's price-equals-marginal-cost result collapses once firms face capacity constraints below total demand: no pure-strategy equilibrium exists and prices cycle endlessly between the competitive floor and monopoly ceiling.
• Feature Creep — Explain why a product accretes capabilities past net benefit as a governance failure, not a quality one — an approval gate that judges each addition in isolation against its stated cost while structurally blind to the compounding global cost of all additions together.
• Innovator's Dilemma — The pattern in which a well-run incumbent, by rationally listening to its best customers and enforcing gross-margin discipline, systematically defunds disruptive innovations and is displaced by entrants whose separate performance trajectory eventually intersects the mainstream.
• Intermediate-Scale Option (the "missing middle") — Diagnose a hollowed-out middle of some continuum — building size, price tier, credential level — not as revealed preference for the extremes but as the artefact of a specific removable rule that burdened the intermediate, so the fix is to change the rule rather than serve the extremes.
• Lerner index — Collapse a firm's market power into one dimensionless number, the markup of price over marginal cost as a fraction of price, L = (P − MC) / P, which under profit maximization also equals the reciprocal of the demand elasticity the firm faces.
• Market power — Gauge an actor's ability to profitably set price above (or wages below) the competitive level by reading the slope of the downward-sloping residual demand curve it faces, quantified as the price-cost wedge (P − MC)/P.
• Market Pull — The innovation situation in which articulated demand-side need — customers naming a problem and willing to pay — directs the search of developers and investors and pulls solutions into existence; the demand-side pole of the push/pull dichotomy, keyed to where the binding constraint sits.
• Monopsony power — Gauge a buyer's ability to set the price it pays below the competitive level by the slope of the upward-sloping residual supply curve it faces (finite elasticity ε), which yields a markdown of roughly 1/ε and the double distortion of underpayment plus under-hiring.
• Oligopoly — A market structure of a few sellers each large enough that its choices visibly move the others, so optimal strategy turns on anticipating rivals' responses — with the outcome swinging between competitive and monopoly-leaning by which equilibrium template (Cournot, Bertrand, Stackelberg, or repeated-game collusion) the market fits.
• Perfect Competition — The idealized market of many small price-takers trading a homogeneous good under free entry and full information, yielding price equal to marginal cost and a Pareto-efficient allocation — a benchmark whose five assumptions, when they break, name every standard market failure.
• Producer Surplus — The gap between the price a seller receives and its reservation price (marginal cost), aggregated as the area between the market price line and the supply curve — the seller's side of a conserved welfare ledger that any market distortion redistributes or destroys.
• Reverse Logistics — Manage the backward flow of goods from consumption toward recovery through one invariant pipeline — receive, inspect-and-grade, route, settle — where the triage sorts each unit up a value gradient and the constraints invert the forward chain.
• Smoke Test — Probe demand for a product that doesn't exist yet with a cheap false-front — a landing page, pre-order, or fake door — that extracts a commitment-bearing signal, and build only if that signal clears a kill threshold set in advance.
• Social Surplus — Measure a market's total net benefit as the area between the demand and supply curves — consumer plus producer surplus — so a policy's efficiency cost reads off the deadweight-loss triangle of trades the price wedge suppresses, distinct from surplus merely transferred.
• Speculative Generality — Diagnose a design that carries flexibility for imagined future variation not yet justifying its cost by pricing each abstraction as an unexercised option — with no named consumer, credible timeline, or second concrete instance, it is overhead masquerading as foresight.
• Supply — Model producer behavior as a whole price-to-quantity schedule rather than a single quantity, upward-sloping because expanding output raises marginal cost, so any disturbance either moves output along the curve (only the good's own price) or shifts the whole curve (everything else).
• Veblen Effect — The anomaly that, for status goods, demand rises with price rather than falling — because the conspicuous high price is itself the costly signal of the buyer's wealth, so cutting it destroys the signal and drives out the very buyers who constitute the market.
• Williamson tradeoff model — The Williamson tradeoff model weighs merger cost efficiencies against monopoly-price welfare losses in antitrust analysis.