The financial cycle has ended up in a very deep financial crisis. Very low interest rates, ultra-low, even negative, policy rates epitomize this crisis; they have raised concerns about the global economy and have triggered heated debates among economists, decision-makers. Central banks, especially those which set the tone in financial markets are under scrutiny taking the center-stage of debates. Top ECB officials cite structural conditions in the European and the world economy as an explanation for the very low interest rates. In essence, these conditions refer to the balance between investment and saving[1]. The IMF also got involved in the debate by saying that ultra-low rates (even negative) are not unjustified in the current context[2]. The BIS, instead, warns repeatedly about side-effects of non-standard measures.