One measure for promoting both stability and fairness across financial market segments is a small sales tax on all financial transactions.

In fact, when drugs are legalized, use sometimes goes down, it's been claimed. Part of the reason is that teenage kids use illicit drugs because they are illicit. They are thumbing their noses at society. If they were legal, they might not.

I think that has a lot of dangers, as does government surveillance, which is way too high.

If you take an economics or a political science course, you're taught that humans are supposed to be rational wealth accumulators, each acting as an individual to maximize his own wealth in the market.

At the beginning of his administration, Reagan tried set the basis for American military intervention in El Salvador - which is about what Kennedy did when he came into office in regard to Vietnam. Well, when Kennedy tried it in Vietnam, it just worked like a dream. Virtually nobody opposed American bombing of South Vietnam in 1962. It was not an issue. But when Reagan began to talk of involving American forces in El Salvador there was a huge popular uproar. And he had to choose a much more indirect way of supporting the collection of gangsters in power there. He had to back off.

Suppose that the US really is trying to get rid of drugs in Colombia. Does Colombia then have the right to fumigate tobacco farms in Kentucky? They are producing a lethal substance far more dangerous than cocaine. More Colombians die from tobacco-related illnesses than Americans die from cocaine. Of course, Colombia has no right to do that.

As for climate change, it's by now widely accepted by the scientific community that we have entered a new geological era, the Anthropocene, in which the Earth's climate is being radically modified by human action, creating a very different planet, one that may not be able to sustain organized human life in anything like a form we would want to tolerate.