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Proudhon’s case against interest seems to depend crucially on his claim that all exchange must be of equivalent values; so pointing out the incoherence of this notion would be a telling reply. But Bastiat cannot officially give this reply (though he comes tantalisingly close over and over throughout the debate) because elsewhere–in his Economic Harmonies–Bastiat explicitly rejects the doctrine of double inequality of value.
How frustrating! Bastiat has so much to teach. But here is one blind spot that kept him from being even better.