In sci.skeptic Sylvia Else wrote:
[...]
But if they're simply trying to obtain their water for the lowest
possible expenditure, which is the situation we're discussing, then the
value is the lowest price they can get, and desalinators will win over
rainwater tanks because it is not possible for rainwater tank makers to
offer a price that competes with desalination. Any price that would
compete would be below the cost.
[...]

Oh dear, we're back to the land of fancy and contradiction.

I realise you must try to have it both ways or neither way to
avoid the horns of the dilemma.

But either you accept there are the std links between price, demand
and supply in which case price tells you nothing about people's
beliefs and what gives them fuzzy fellings; or you assume people do
what they will, there is no causal link, and you can say even less
about what prices mean.

--
R Kym Horsell

If your ideas are any good you'll have to ram them down people's throats.
-- Howard Aiken