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the four largest firms produce at least 70 to 80 % of the output
There are three main characteristics of oligopoly. They are industry dominated by a small number of large firms, the firms sell identical or similar products, and the industry has significant barriers to enter.
A market is an oligopoly when a small number of sellers dominate a market or industry. Economists use a set of criteria to determine whether a market form is an oligopoly. These criteria include profit maximization conditions, ability to set price, high barriers to market entry, a small number of firms, long-run abnormal profits, product differentiation, perfect knowledge of cost and demand functions, interdependence on other firms' marketing strategies, and non-price competition.
Yes, it is an industry standard for home security companies alarms to directly call the local police department if they are triggered. They usually call a fire truck also.
Its depends on what you call expensive, The E3 usually costs $400 to $500 and is only open to industry professionals.
the food industry
call center is the fastest growing industry now
If your question is "What do you call someone who uses the products made by industry?", you call him a consumer.
The question reference the incidence of oligarchs. Oligarchs are essentially king-pins which can singularly dominate entire industries and economies. Oligarchy is often used to describe the economic takeovers by a handful of men of Russia in the early 1990s to the present. An example of Oligopoly was Russia's Gazprom under Mikhail Khodorkhovsky. Individual oligarchs include Roman Abramovich, Alisher Usmanov, and the exiled Vladimir Gusinsky and Boris Berezovsky.
an industry
We call it, Farming
Call center jobs that are usually readily available are positions as phone salespeople because they require little invasive knowledge of the industry. You can find nearby centers with job openings in a local newspaper.