is that collectively they seem to know very little economics. The existence of negative externalities is basic knowledge. The example most often used is chemicals washed downstream from farms. This passes the pollution costs to people and fish downstream. Hence, algal blooms.
You use regulations and/or taxes to stop them doing the damage.
So what does Trump want to do? Pollute, of course. Fine for polluters. Bad for everyone who pays the price (eg children with asthma in polluted cities).
These are either dim-witted or evil people.
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