In addition, seniors who exercise suffer fewer falls, less depression and reduced pain, according to a report in the March 2000 issue of the Journal of the American Geriatric Society.

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If suddenly half of the subscribers go away, that means production budgets get severely cut, quality falls and fewer people want to watch.

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This is because the additional output of the last worker hired falls by 12.5% (as he works fewer hours), but the cost of employing him falls by less than 12.5% because the fixed costs of employment are unchanged.

ECONOMIST: Labour markets

This figure falls even further among the over-65s, where fewer than one in three receive support, the research found.

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In his book, Mr Sen raised the theoretical possibility that a pastoralist's supply curve might actually bend back on itself: as the relative price of livestock falls, a hungry pastoralist might supply more animals to the market, not fewer as elementary economic principles would imply.

ECONOMIST: Economics focus

As female employment has risen and divorce become acceptable, there are probably fewer people who feel like that among middle-aged and older women, the groups that have seen the sharpest falls in suicide rates.

ECONOMIST: Suicide