Tim Harford on the recently imposed “hosepipe bans” in parts of southern England:
But it was chucking down with rain this week. It was snowing, too. How can we be talking about drought?
Water isn’t like electricity: it can be stored, within limits. You don’t get a water shortage if you have a dry week and you don’t cure a water shortage with a few April showers. You get water shortages after a couple of years of low rainfall.
And how do you cure water shortages?
Hosepipe bans, apparently.
Is that a good idea?
Probably not. It’s appealing for the water companies because the revenue they receive is capped by the regulator. They can’t make more money by supplying as much water as possible to as many joyful customers as they can reach. It’s easier to just yell at customers to stop watering their lawns. It might be annoying but the water companies don’t lose much as a result.
[. . .]
You’re not suggesting a “flushing the toilet ban”?
I am not suggesting any kind of ban. It’s the idea of the ban that’s problematic. A new article by economists Jeremy Bulow and Paul Klemperer analyses the advantages to consumers of rationing schemes rather than simply raising the marginal price. The bottom line: the advantages are typically illusory. Rationing reduces supply, relative to what could be provided if prices were higher. It also misallocates resources — there’s no reason to expect that the people who get the scarce product are the ones who value it most. And rationing encourages all kinds of fun and games to try to get around the rules.
So you just want water to become more expensive.
I hope water will become cheaper, on average. But I certainly want it to be expensive to use lots of water at a time of shortage. We want everyone to have an incentive to save some water and the obvious way to do this is through water metering.
