EN
Realistically, monetary policy in the contemporary economy has been facing functioning of commercial banks inconsistent with the textbook model. According to the Goodhart's law, banks have been finding out the solutions effective to protect their income notwithstanding the intentions of the monetary authority. Such motivations have also been driving the increasing involvement of the banks in the use of i.a. fixed interest rate securities in management of bank assets and liabilities. This has been contributing to unpredictability of effects of the changes of the short-term interest rate of the central bank on the financial sector and real economy.