not for profit housing associations It is not obvious in some analyses, but it is important to note that economic profits include opportunity costs. The profit of an entrepreneur (normal profit) is usually positive, but economic profit can be either positive or negative (loss). That's why the opportunity cost is included: in a completely competitive market, when marginal cost equals marginal revenue, profit maximization or loss minimization conditions arise. If the market price is lower than the total average cost, which means that the economic profit is negative, the entrepreneur needs to compare the value of the loss and the average variable cost. If the business continues to operate, the negative economic profit must not be lower than the average variable cost, otherwise the entrepreneur would rather shut down the company than continue to take the loss. The one solution they have come up with to aid arouse auto system and to assist visitors to spend some money is always to request more loans and borrow millions if not trillions of dollars. Numerous people feel that this can be a method which may work. While others are worried since it will press the nation farther into debt. This makes us ask the question of, "When is it to certainly ask for money." The conversion of commodity value into cost price + profit (k+p) includes the possibility of deviation from the residual value. Because profits for more than the balance of cost price, and the cost price is less than the goods value, it provides the individual capitalists in cost price above and below the value of the possibility of selling goods, so that to achieve the profit with the goods actually contains surplus value does not agree in number. The capitalist makes use of the difference between the value of the commodity and the cost price, as a driving force in the market competition. As the competition between different production department and the free flow of capital, make different special margin balance into average profit margins or average profit margins, so that the profits further into average profit, realize the amount of capital to achieve the same amount of profit. In the usual case, the average profit and the surplus value are inconsistent in quantity. The average profit is proportionately proportional to the total amount of capital in advance and not the amount of live labor that is governed by individual capital. This and make an objective truth, essentially profits is the product of capital, it is nothing to do with labor, in this way, capital on the relationship between the wage labor to make money and to be make, will be further. For the past five years, I've been using the west coast service every week, booking tickets 12 weeks in advance to get the cheapest prepayment, currently at 17 pounds. Based on the above two kinds of comparison and analysis of the concept of earnings, reveals the inadequacy of accounting earnings, i.e., the accounting income does not take into account inflation, the production gains, goodwill to improve the impact of changes and their value, and can be found on only the pursuit of reliability, and can be measured, which affect the enterprise's profit ability and continuous operation ability. Accounting, since the 1950 s began to pay attention to absorb the income concept of some reasonable kernel of economics, the concept of modern accounting theory of income in the income concept of economics.