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. The accounting income follows the historical cost principle and the matching principle, which is conducive to the objective reflection of the business management responsibility of the enterprise management authorities. But, due to the historical cost principle inherent defects, especially according to the present value of revenue and expenses by historical cost line, makes the calculation of accounting earnings lack of inner logical unity, and the matching principle is difficult to carry out, so that the book value of assets can not reflect its real value, cost cannot be fully compensated. And the economic benefit is measured in the current value, which reflects the actual value of the asset, which is beneficial to the full compensation of the cost. So why is yu 'e bao falling steadily? So now that it is the end of the year, it is a good time to reflect on what we have done to achieve these goals. Block chain can create a world in which all requirements were met, everyone can express their own points of view, we can take meaningful global cooperation, can benefit through different experience. The differences between the two countries are significant because the basic national conditions and economic system of the two countries are fundamentally different. Planned economy and planned economy into market economy, the stage because the traditional pattern of economic and financial structure, imperative the mandatory administrative regulations directly effective, fast, accurate, coupled with the central bank's marketization operation ability is limited, the lack of experience, the benchmark interest rate to today still become society's widespread interest rate decision criteria. The fed is highly marketable, with each "federal funds rate" adjusting to market results after open market operations.