what is social profit The fund's fourth consultation underlines the enormous uncertainty facing Britain in the ambitious task of negotiating an exit from the eu. Security is very important, reduce risk is big potential! 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. ECB President Mario draghi said at a press conference following the central bank's board meeting that important changes had taken place in the resumption of negotiations.