But the authors of the other study, Finkelstein et al. calculate a figure of 78 calories for store bought SSBs per low-income household member.

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When low-income household members buy PCs, they tend to purchase systems that are more sophisticated than computers with rock-bottom price tags, according to Dave Tremblay, InfoBeads senior industry analyst.

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In addition to looking at personal characteristics such as age and relationship status, the researchers divided the countries into high- and middle-to-low income groups according to average household earnings.

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Median family net worth has hit a two-decade low, median household income has declined, more than 30% of borrowers are underwater on their mortgage, 23 million Americans remain unemployed or underemployed, and half of college graduates this year come out of school unemployed or underemployed.

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Close to three-fourths (72 percent) of those low-income entrepreneurs experienced almost a tripling in their household income.

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Since groceries make up 12% of household spending and as much as 25% for low-income Americans, this distortion significantly understates real incomes, especially at the bottom.

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In American households with less than half the median household income, only 33% of adults have a low-paid job.

ECONOMIST: Not so fair pay

Double-digit house price inflation has been caused by a combination of low interest rates, relatively high disposable household income and the popularity of property as an investment when stock markets have performed poorly.

BBC: House prices 'to rise 12% in 2003'