The negative interest rate, like zero-close, is an old-fashioned phenomenon in economic policy, which is increasingly involved in post-crisis monetary policy. Interest, as the time value of money, can only be positive in some macromodels, which is linked to the liquidity premium and the "impotence factor". Anyone who wants to use money to buy goods in the present has to pay a premium to those who are willing to give up on it. At the same time, monetary practice has evolved in the opposite direction in several countries over the past period. One of the most spectacular appearances of the modern history of the negative "savings saver" interest rate is the negative rate imposed on the depositor at the central bank. The negative interest rate w...