There are a number of business units and the duopoly. Each list is a list of each big
sellers in the market is affiliated and depend on each other. Make the product of business units may be able to price higher than the rival
.The characteristics of a product or service in the market may be identical or different, and can substitute for each other
to enter the market of the new business unit will be difficult. But out of the market of the business units originally didn't succeed easily
.Products on the market, such as cement, beer, soft drinks, cars, etc.
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