Topsy-turvy interest rates have some people worried, but economists interpret the current rate picture to mean that the record economic expansion is safe for a while.

With longer-term Treasury securities trading at lower yields than those of medium-term duration, the Treasury yield curve has inverted - often a bad sign for the economy. It means the cost of borrowing at a maturity of five years is higher than for 10 years, presumably reducing the profitability of bank loans , and that 10-year note yields are higher than those on the 30-year bond.

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