This kind of research is called a meta-analysis.

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"The growth rate is declining, and that means fewer opportunities for Andersen and others, " says Dean Davison of the Meta Group research firm.

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"It's a little of each, " says Maria Schafer of Meta Group , an IT research and consultant firm.

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In a meta-analysis of the research literature on alcohol taxes and their impact on consumption, Wagenaar et al. found that a 10 percent increase in alcohol prices would result in a 5 percent reduction in drinking.

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