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It is found that under duopoly prices the market size of a Commune required for single firm entry is about twice as large as under monopoly prices. From a welfare perspective, therefore, it can be stated that "two is enough" to ensure competition in this market.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.