When marijuana is illegal, people use it, growers damage the environment while growing it, and the government wastes money chasing growers and users.
When marijuana is legal, people use it, growers shift to legal and sustainable sites, and the government makes money on taxes and saves money on policing...
When water shortages are addressed by supply-side and command and control policies, then money is wasted, the environment is depleted, and people are annoyed.
When water shortages are addressed with higher prices, then utilities have more revenue (to reward lower users or fix leaks), lower demand helps the environment, and people choose their water use.
Inspired by one of Fleck's posts.