Marx's interest rate determinism is based on the source and essence of interest. Marx reveals that interest is a portion of the surplus that the capitalist who lends capital is divided from the capitalist who borrows the capital, and the profit is the transformation form of the surplus value. Consumption is up 3.1 per cent, according to mastercard, but online retailers are experiencing the best performance of the sales growth, up 12 per cent year on year. Although the supermarket's busiest day is expected to be Friday, card operators have found that spending on groceries has fallen by 0.1% so far. 2. Accounting earnings are based on the assumption of accounting instalments, which refers to the production and operation results of a certain period of time. Early accounting earnings is calculated according to the cash basis, and the modern accounting earnings is according to the classification current income and expenses of accrual basis, after the appropriate ratio calculated. However, the benefits of cash determination are more acceptable to users. (1) spiritual gain -- spiritual satisfaction; Jeffrey Currie of Goldman sachs analyst and Michael Hinds, wrote in the latest report, the next three months, six months and 12 months of gold prices were at $1225 an ounce and $1200 an ounce and $1225 an ounce. Then the interest rate theory of the loan is the interest rate theory of neoclassical school, which is proposed to correct Keynes's theory of "liquidity preference". In some ways, the theory of interest rate can be regarded as a synthesis of classical interest rate theory and Keynesian theory.