Famous British economist hicks and others argue that the above theory did not consider the factor of income, and therefore unable to determine the level of interest rates, in 1937, and puts forward the is-lm model on the basis of general equilibrium theory. It establishes a theory of interest rates and income at the same time that the four factors of savings and investment, money supply and monetary demand interact. Central bankers' tasks are limited to keeping inflation stable and independence easier to maintain. Given this narrow mandate, the allocation of central bank decisions is limited. Moreover, it is easier to explain how the central bank's policy tools are linked to its political mandate. So what are these three factors? They are Cost-Per-Click's (CPC's); which is the sum of money Google pays in the market to a publisher after their ads are clicked by way of a visitor. Click-Through-Rates (CTR's); which is a percentage figure showing frequent AdSense ads are clicked divided by the quantity of unique visitors passing by having a particular site and also the third essential factor is traffic levels. The accounting income maintains the financial capital preservation, namely, the monetary value that only requires the owner to invest is not eroded, the enterprise income exceeds the input value part is the accounting income. Accounting focuses on reporting financial results. The economic benefits insist on physical capital preservation, which can only be confirmed when the actual production capacity of the owner is saved. It is believed that only by maintaining the actual production capacity of the enterprise can the enterprise reproduce smoothly. Physical capital preservation is more meaningful than the income of financial capital preservation, but it is difficult to measure. Enterprise due to withdraw, and transfer or liquidation disposal of equity investment and equity investment losses, can be in pre-tax deduction, but the deduction of each tax year equity investment losses, shall not exceed the implementation of equity investment income and transfer income, more than part can be to a tax year after deduction carry forward indefinitely. Economist lynde hull explained that the benefits of capital in different periods of time would be interest. According to linde hull, interest in a specific period and the difference between the expected consumption is savings (during the period of the growth of capital), and returns the sum of consumption and savings are given period of time. The international monetary fund cut its growth forecast for the UK to 1.6 per cent this year from 1.7 per cent in October and is expected to grow by 1.5 per cent in 2018.