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B - Blocked Entry: Industry entrance is closed because of natural conditions or governmental directive. By definition this leads to only one supplier in a given market.
U - Unique Product Without Substitute: There are no close alternatives that are viable for most consumers. Examples include a city's water supply.
G - Goodwill Advertising: Advertising may be used for goodwill purposes. Advertising is also used to convert buyers from a substitute good (electricity vs. natural gas vs. coal).
S - Single Firm in Industry: Only one player is at the table in a given market. This high market concentration may mean there is little incentive for a business to innovate, introduce new products, or find and implement new cost-savings technologies; efficiency is not usually maximized.
S - Significant Ability to Set Prices: A monopolist can implement different business plans by varying prices. The demand curve may be highly inelastic. As compared to pure competition, monopolists usually charge a higher price and produce a lower rate of output.