Software substitution, whether it's for drivers or waiters or nurses ... it's progressing. ... Technology over time will reduce demand for jobs, particularly at the lower end of skill set. ... 20 years from now, labor demand for lots of skill sets will be substantially lower. I don’t think people have that in their mental model.

The idea of explaining why free trade is good, why immigration is good, why the world is so connected, that we need to think in terms of humanity and being generous to each other, you know, that's proving to be a challenge.

Vaccination is pretty special because you can do a vaccination campaign anywhere in the world. All you are doing is gathering women from the villages, getting them the vaccines and asking them to go around and find the children.

The moral systems of religion, I think, are super important.

The only role other than paying their taxes, whatever those are, the only role for philanthropy broadly - of which the rich should give disproportionately - the more, the better - and I think there is a positive trend in that direction - there are certain risk-taking things, like trying out a new type of charter school or funding a new kind of medicine.

You might say, well, aren't people saying that about wind and solar today? Not really. Only in the super-narrow sense that the capital costs per output, when the wind is blowing, is slightly lower.

If Africa seeks prosperity, it must provide for the health and nutrition of all – including the poorest.