In an arid land city, a rich person can use almost ten times as much
water as a poor person.
Cities head towards a water shortage should
strictly limit water consumption by the rich years before what they
would call a "crisis".
Private wells also deplete the same ground water that makes up the
last resort for the region. They should be strictly regulated.
By contrast, building private desalinization plants run by renewable
energy should be encouraged, because they increase the total water
resources available to the region and don't take it away from anyone
else.