The result of all of these factors is that in 2004, 56.4% of households in the bottom fifth featured no work by anyone for the entire year, not even part time work, leaving the average number of workers per household in the bottom fifth rounded down to zero by the Census Bureau.

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At 4%, the household savings rate has jumped sharply from its low of near zero, but it is still far below its post-war average of 7%.

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More remarkable than the amount of Japanese household financial assets is their structure: 60 percent are in essentially zero-yield bank deposits.

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But they did zero in on movies by controlling for a wide range of extenuating factors, including race, household income, school performance, parenting styles, smoking among friends and family members, and even personality traits such as rebelliousness.

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Tesco says the "Buy One, Get One Free Later" is part of a wider goal to turn it into a zero carbon business by 2050 and increase low carbon choices for customers, reducing the amount of household waste.

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