Howard Penney, an analyst at Friedman, Billings, Ramsey in New York, thinks Starbucks needs to cut its rate of expansion in America by half. "They are a mature market," he says.

纽约Friedman, Billings, Ramsey公司的分析师Howard Penney认为，星巴克需要减少一半其在美国的扩张速度。他说美国市场是一个成熟的市场。

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For the past two decades, the research has been updated by Howard Friedman, a professor of psychology at the University of California at Riverside.

BBC: The science of a long life

Howard Penney, an analyst at Friedman, Billings, Ramsey in New York, thinks Starbucks needs to cut its rate of expansion in America by half.

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