Costs are incurred to produce future in the production of revenues benefits usually mean As are used up are said to expire. Expired costs are called expenses. In each period, expenses are deducted from revenues in the income statement to determine the period's profit. For a company to remain in business, revenues must consistently exceed expenses, moreover, the income earned must be large enough to satisfy the owners the firm. Thus, cost are related in the sense that price exceed so that and price lowering prices increases customer value sufficient income is ability to lower prices is connected to by low customer sacrifice, and the cost the ability to lower costs. Hence, managers need to know cost and trends in usually, however, knowing cost means knowing what something or some object costs. Assigning costs to determine cost of this object is therefore critical the in providing this information to managers.