Blake Gwinn, head of U.S. Rates Strategy at RBC Capital Markets, writes a weekly commentary appropriately titled Ahead of the Curve. Barron's Senior Managing Editors Lauren Rublin and Ben Levisohn speak with Gwinn after the Federal Reserve's Sept. 16-17 policy meeting and rate-cut decision about the future path of interest rates, the economic outlook, the challenges facing the central bank, and the implications for investors as the labor market weakens and the Fed's dramatis personae shift.

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