We have this highly irrational system of incentivizing innovation for clean and green technologies, where we allow the innovator to have a temporary monopoly and then mark up the price of the product or sell licenses at high prices to those who want to use the kind of product that the innovator has invented. This system is collectively irrational because many people, to avoid the inflated prices of still-patented cleaner and greener technologies, opt for some older technology that is much more polluting.

It is perfectly consistent - and also true - to say that the world poverty problem today is smaller (relative to world population) than before and yet also a much graver injustice.

Critical journalism has gone out of fashion, or rather, it has been bought out. And so, we have much less of it than we did during the Vietnam era, where there was very critical reporting on the Vietnam War and a lot of disagreement among the media. Now you find that the media are much more homogenous, converging because they all must cater to the same community of advertisers. It's sad to see.

Social rules are susceptible to moral analysis. This is, again, relatively familiar in the domestic case, where we now condemn slavery as unjust. And when we affirm this judgment, we're not merely saying that all those people who owned slaves were unethical people; they shouldn't have done that. We do believe this, but that's only part of the point. We also believe that the fugitive slave laws were unjust.

Purchasing power parities are not a reasonable method for comparing households across countries or currencies. The reason for this is simply that PPPs are sensitive to the prices of all the commodities, goods and services, that households are consuming worldwide, with each commodity weighted in the calculations according to its share in international household consumption expenditure.

The bottom half of humanity is living in severe poverty; not all of them are malnourished or severely deprived now, but they are extremely vulnerable to even small upsets in their income or in the prices they face of basic necessities, and when something like this happens, they can be thrown off kilter in terms of a disease of a family member or a change in food prices; anything like that can throw them into destitution.

Countries compete in offering easy working conditions to their banks. In many jurisdictions, you can deposit money anonymously with no questions asked, even if the accepting bank knows that it derives from criminal activities.