Feudalism is an economic system where a few people own all the land and the others have no option but to be serfs on such a feudal estate. We now condemn feudalism. We condemn not merely the feudal lords but we condemn the whole structure of rules that sustained feudalism. I am asking people to think similarly about the world economy.

The bottom quarter of the human population has only three-quarters of one percent of global household income, about one thirty-second of the average income in the world, whereas the people in the top five percent have nine times the average income. So the ratio between the averages in the top five percent and the bottom quarter is somewhere around 300 to one - a huge inequality that also gives you a sense of how easily poverty could be avoided.

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.

It seems far-fetched, even preposterous, to blame the global economic order for the persistence of severe poverty in countries that are ruled by obvious thugs and crooks.

To make a proper moral appraisal of the prevalence of severe poverty today, we should focus not on comparisons with times past, when the global average income was much lower, but on a comparison with what would be possible in our time, given the current global average income and level of technological and administrative development.

In the United States there are only two exceptions: banks have to report deposits they suspect to be related to either terrorism or drug trafficking. But if your funds derive from trafficking women and children for sexual exploitation, for example, or from illegal arms trafficking or any other illegal activity, then banks in the US are legally free to accept your money and are not required to report your deposit to the authorities.

What we should do is require or at least permit innovators to license their green innovations free of charge in exchange for public payments based on the impact this innovation has on the environment - emissions averted or something of this sort.