Both sides have agreed that the Longjing field, which more certainly extends across the median line, will in future also be developed jointly, with costs and profits split.

ECONOMIST: China, Japan and Taiwan

Japan claims its boundary as the median line.

ECONOMIST: China, Japan and Taiwan

Economists reckoned the uplift in happiness at that time was equivalent to 60% of the increase in wellbeing people tend to experience when they cross the line of median income, from the third income quartile into the second one.

BBC: Going for the happiness gold

If median incomes fall, then the poverty line falls.

BBC: It��s not the 'squeezed middle', it��s the poor

The orange line shows the 1979 to 2000 median extent for that day.

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If the poverty line is drawn at 40% of median household income rather than 60% the government's definition there has been no improvement since 1997.

ECONOMIST: Income inequality

There's no official poverty line but it's generally defined as half of the city's median income.

NPR: Hong Kong Poor Living In Cages And Cubicles

An influential exponent of the first approach was Lester Thurow of the MIT's Sloan School of Management, who took as his reference point the median income in America where there is an equal number of people above and below the line and defined the American middle class as the group with incomes lying between 75% and 125% of the median.

ECONOMIST: It��s a matter of definition