In this paper, we review a range of approaches used to capture monetary policy in a period of Zero Lower Bound (ZLB). We concentrate here on methods closely linked to interest rates, which include: spreads, synthetic indices from principal component analysis, and different shadow rates. Next, we calculate these measures for the euro area, draw comparisons among different approaches, and look at the effects on main macroeconomic variables, with a special focus on inflation. By and large, the impact of unconventional monetary policy shocks on inflation is found to be significantly positive across studies and methods. Finally, we summarize the literature on the Natural Real Rate of Interest. This overview may help to assess how long low (real) interest rates in a ZLB stay in place, potentially leading to more accurate policy recommendations.
 

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