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Affordability indicator

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The affordability index is the ratio of the price of 120 m3 of water used by a household of 3  (water supply and sanitation) to the income of that household. When the affordability index is too high, social measures may be required. In France and UK, an index of 3% is considered reasonable by official bodies. In France a bill has been proposed to alleviate water expenditures of those having to spend  over 3% of their income for water bills. 

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