The European Central Bank implemented a negative interest rate policy yesterday. Whilst we have become very accustomed to a low base rate in the UK, the ECB policy seems extraordinary.The policy has come about due to a continued concern over the economic situation in the Eurozone. Growth remains weak, unemployment is high and inflation sits below the target of 2% in many of the 18 countries. The ECB is unlikely to follow the UK (and others) strategy of quantitative easing and so is left with fewer choices.By setting a negative interest rate, the ECB wants to discourage banks from keeping larger reserves and promote a greater level of lending (and thus stimulate economic growth).If you want to download a short Powerpoint slideshow that explains the policy and its possible consequences then click on this link.