Iscuss whether there a case for a higher inflation target than 2%

Question
i??No economic research has convincingly determined the optimal inflation rate.
Yet many central banks have chosen a common policy: an inflation target near
two percent.i??
(Ball, L. (2014). The Case for a Long-Run Inflation Target of Four Percent. IMF Working Paper WP14/92)
Discuss whether there a case for a higher inflation target than 2%.

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Added on 26.04.2015 20:05
The structure should be clearly and you need to present your personal critical thinking and logical thinking.