American consumers shifted into a higher gear in the second quarter, spending at the fastest quarterly pace in two years, retail sales figures will probably show on Friday. Economists project a 0.3 percent gain in core sales for June, which would take the three-month annualized gain in the so-called retail control group to 6.6 percent barring revisions. The figure is used to calculate gross domestic product and excludes food services, auto dealers, home-improvement stores and gas stations.

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