Indeed, one constant feature of the saga is that economists, investors, and the commentariat are continually surprised, having been previously gently rocked into a belief in a stable economic state of the world, massaged for some by Keynesian principles and, for others, by a blind faith in the power of benign, self-regulating, markets. But I digress.
In normal financial transactions, such a thing would never happen. When a central bank wants to lower interest rates through its monetary policy, it normally will increase the amount of money provided to the markets. As a result, a greater number of people want to lend or invest extra money.