Lesson preview · Monopoly Basics
What Is a Monopoly? A Short History
~5 min · Free to read
In 1882, John D. Rockefeller’s Standard Oil controlled roughly 88 percent of the refined oil flowing through the United States. He didn’t get there by being a slightly better refiner. He cut secret rebate deals with railroads so his oil moved cheaper than rivals’, bought up pipelines, and undercut prices in any local market a competitor tried to enter — then raised them again once the competitor folded. That’s a monopoly: a market with one seller who can shape the price, not just take it.
Key Term
Monopoly and market power
A monopoly is a market with a single seller (or a dominant one that behaves as if alone). The seller has market power — the ability to set the price by choosing how much to produce. A competitive firm faces a market price it must accept; a monopolist faces the whole demand curve, and trades quantity for price along it.
Three short cases show how monopolies actually arise. Each one points at a different mechanism — and a different reason competitors couldn’t, or weren’t allowed to, enter.
Tip
Case file: Standard Oil (United States, 1870–1911)
Rockefeller’s edge was logistics. He owned pipelines, cut volume-rebate deals with railroads so a barrel of his oil moved cheaper than anyone else’s, and bought up competitors when they couldn’t match his costs. At its peak, Standard refined about 90 percent of US oil. The Supreme Court broke it up in 1911 under the Sherman Antitrust Act, into 34 companies that became Exxon, Mobil, Chevron, and others.
Source of power: control of essential inputs (pipelines, refining capacity, rail rates) plus aggressive pricing to block entry.
Tip
Case file: East India Company (England, 1600–1858)
Founded by royal charter from Elizabeth I, the East India Company had an exclusive legal right from the English crown to all trade between England and Asia. Anyone else who tried it was breaking the law. For 250 years the Company effectively was the British presence in India — running customs, raising a private army, even minting coin. It’s the cleanest example of a state-granted monopoly in history.
Source of power: a government-granted legal monopoly. No competitor was allowed to enter.
Tip
Case file: De Beers (South Africa, late 1800s onward)
Cecil Rhodes’s De Beers consolidated the South African diamond mines in the 1880s, then organised a global cartel — the Central Selling Organisation — that bought rough diamonds from other producers and rationed supply onto the market. For most of the 20th century, De Beers brokered around 85 percent of the world’s diamonds. The famous “a diamond is forever” slogan and the engagement-ring norm were both invented to prop up demand.
Source of power: cornering the supply of a key resource and coordinating output across producers.
These look very different — a refiner, a colonial trading company, a diamond cartel — but they cover most of the mechanisms economists track. Pulling back, there are four standard ways a monopoly arises.
Key Term
Four sources of monopoly power
- Control of a key resource — owning an essential input that competitors need (Standard Oil’s pipelines; De Beers’s mines).
- Government grant — patents, copyrights, exclusive licences, royal charters (the East India Company; today’s drug patents).
- Natural monopoly — production technology with such high fixed costs that one firm serving the whole market has lower per-unit cost than two could (water utilities, electricity grids). We’ll spend the next lesson on this case.
- Network effects — the product becomes more valuable as more people use it, so an early lead snowballs (early telephone networks, modern social platforms).
Check yourself · no marks
All four sources of monopoly power come down to the same underlying thing. What is it?
Commit to one first. Guessing and being wrong beats reading the answer cold.
Practice · 1 / 4
The defining feature of a monopoly (compared to a competitive firm) is:
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