An insurer that sought to charge everyone the same rate would quick find itself in the red when people whose expected costs were higher than the flat rate raced to sign up.

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When the yield curve is inverted or relatively flat, it is a sign that investors are so afraid of future economic weakness that they are willing to take low interest rates on long-term holdings for fear that returns will become even less attractive later on.

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Another sign gold's rebound may run flat is that metal held by gold exchange traded funds has declined even as prices recovered.

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