Bank stock indexes have consistently rallied after selloffs since April, but each successive peak has been lower than the last. In the parlance of chartists, who look for technical patterns in stock fluctuations over time, bank stocks have recently formed double-tops: a high, followed by a dip, followed by another high.

Two equal peaks suggest resistance to higher prices, the chartists say. But if successive peaks fail to reach their former levels, chartist theory predicts a continuing decline.

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