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"Couple's Numeracy Skills Linked to Greater Family Wealth, Study Finds" - Science Daily. 11/10/2010.
Using data on married couples from the HRS, Robert Willis, James Smith, and John McArdle found that scores on a simple numeracy-related skills test were highly related to average household wealth. Numeracy is the ability to reason with numbers. The findings are published in the November 2010 issue of The Economic Journal.