In his theory, money supply is controlled by the central bank and is an exogenous variable with no interest rate elasticity. At this point, monetary demand depends on people's psychological "liquidity preference". Interest rate, in the form of expression, refers to the ratio of the amount of interest to the total amount of borrowed capital in a certain period of time. [1] the interest rate is the interest level per unit time of the unit currency, indicating the interest rate. Economists have been looking for a theory that can fully explain the structure and change of interest rates. Interest rates are usually controlled by the central bank of the country and administered by the federal reserve board in the United States. Today, interest rates are one of the important tools for macroeconomic regulation. For those who have already dabbled in this field, their confidence in the future of the blockchain has been validated and consolidated through a huge crowdfunding fund. So far, about $3.6 billion has been raised based on the etheric block chain, which makes it a "killer app" for the platform. “It’s time to end this undercutters’ charter and for the government to scrap this loophole. It’s recent review into modern employment practices called for precisely that.” The Resolution Foundation said the loss of pay across all sectors took the average loss for each of the UK’s 800,000 agency workers to £500 a year, up from £430 last year. The fund's fourth consultation underlines the enormous uncertainty facing Britain in the ambitious task of negotiating an exit from the eu.