But the case he makes seems to echo the analysis of some Wall Street economists, who view population growth as a critical advantage the United States will enjoy over China and the euro zone.

WSJ: The Weekend Interview with Rick Santorum: 'Supply-Sider' for the Working Man

Others maintain he is still running last year's presidential campaign, and that he needs to show himself as more presidential, by using his position to calm and explain, rather than merely echo the public's frustrations at Wall Street.

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