1) The rationale that Fed is giving is that if inflation is low, then interest rates would also remain low. Then in the case of a recession, Fed will have little headroom to reduce rates and as such could lead to very limited actions by the Fed. So in order to build enough capacity during the economic expansion, Fed is thinking about letting inflation cross 2% so that interest rates could also rise higher.
2) The rise in inflation, if significantly higher than US's trading partners could impact the value of the dollar vis-a-vis other currencies and could lead to a depreciation in the value of the US dollar.
3) As stated above, a higher inflation in the USA as compared to its major trading partners might lead to a depreciation in the value of the dollar.
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