But if the recent weakness in the dollar, run-up in commodity prices, and other forward-looking indicators are sustained and passed along into final prices, the Fed's price stability objective might no longer be a compelling policy rationale.

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Again, the rationale was that a majority of customers would accept one or the other price plans, a few may accept both services, and some would leave.

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But the fickle nature of commodity trading has derailed yield-hungry ambitions across the currency world leaving a question mark above the rationale or at least the desire among central bankers to shift policy in order to address temporary price spikes.

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