Here's What Economists Think About Negative Policy Rates

They don't do much for inflation and will last until at least 2018
From

What Do Economists Think About Negative Rates?

Bloomberg surveyed 63 economists covering central banks in the euro area, Switzerland, Denmark, Sweden and now Japan where negative policy rates have been implemented. We found that rates below zero are thought to work better in smaller, open economies dealing with foreign exchange challenges rather than in larger economies hoping to boost growth or tackle falling prices.

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