The numbers: Sales at U.S. retailers jumped a bigger-than-expected 0.7% in September in a sign households have enough buying power to keep the economy expanding.
Economists polled by The Wall Street Journal had forecast a 0.3% increase in sales.
Retail sales represent about one-third of all consumer spending and usually offer clues on the strength of the economy.
Yet September also falls between the busy back-to-school and holiday-shopping seasons and tends…
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