Each concept here is mapped to its prerequisites — the ideas you'd need first to understand it — all the way down to four foundations: Space, Time, Energy, Pattern. Click any prerequisite to drill down, or scroll for the chain graph.
External reference — all senses of the word “duopoly” on Wiktionary. This atlas concept maps to only the slice of meaning relevant to the prerequisite graph.
A market structure where two firms dominate the market, controlling a significant share of production, distribution, or exchange, with limited competition from other firms.
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