When the Federal Reserve surprised markets with a 0.75 percentage-point cut in the federal-funds target Tuesday morning, the thinking was that concerns about a U.S. recession had so fully enveloped the markets that just about anything could happen. Sure, the thinking went, the Fed was in danger of looking like it had responded to market action rather than an economic report, but if markets were reacting to economic reports, well, it’s all the same in this world these days.