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Costs
Why do firms care about coasts? Clearly they must pay careful attention to costs because the total amount of cost reduces the firm’s profits. But costs are important in economics for a deeper reason: firms will decide how much of a good to produce and sell depending on the price and cost of the good. More precisely, supply depends upon incremental or marginal cost. And the dependence of supply decisions on cost is true not only for perfect competitors but also for firms in the vast field of imperfect competition.
Whatever the market structure, whether perfectly or imperfectly competitive, marginal cost is a key concept for understanding a firm’s behaviour.
The major elements of a firm’s costs are its fixed costs (that do not vary at all when output changes) and variable costs (that increase as output increases). Total costs are equal to fixed plus variable costs: TC=FC+VC.
“Total cost” represents the total expense needed to produce each level of output.
“Fixed cost” represents the total expense that is paid out even when no output is produced; fixed cost is unaffected by any variation in the quantity of output.
“Variable cost” represents expenses that vary with the level of output – including raw materials, wages, and fuel-and includes all costs that are not fixed.
Monopoly
How imperfect can imperfect competition get? The extreme case would be that of a single seller with complete control over an industry. (Such a firm is called a “monopolist”, from the Greek words mono for “one” and polist for “seller”. This firm is the only one producing in its industry, and there is no industry producing a close substitute for its good.
Exclusive monopolies are rare today. Only in the case of franchised local services – local telephone, gas, water, and electricity being the major examples- is there truly a single seller of a service with no close substitutes. But even those isolated examples must reckon with competition from other industries – with cellular telephones for cable phones, with other fuels from electricity or gas. No firm is completely secure from attack by competitors in the long run.

Помогите, пожалуйста!Очень нужно, английский совсем не понимаю( Учусь на экономиста, на английский ума никак не хватает((