Ethan Gach at TLoOG puts his finger on what it was about Noah Smith’s article about the poor and saving that didn’t sit quite right:

Hmmm, I wonder what would happen if everyone started saving as much income as they reasonably could? Where would the high yield investments be with so much capital sloshing around? How would the markets react when aggregate demand plummets even further?

Snark aside, the key here is that, while it would benefit any individual poor person to save more (assuming, of course, that’s possible given their income and cost-of-living, which is not an assumption I’m eager to make), if every poor person somehow stumbled onto Smith’s article and tried to save more it might generate economic disequlibria that wouldn’t benefit anyone. This is semi-related to the point I’ve made before that aggregate saving is a very different animal than individual saving.

IMHO, the best thing we can do for poor people is to a) give them money and other stuff (mostly healthcare), but perhaps more importantly b) make American richer so that we can more easily afford to give poor people money and healthcare. Public policy-wise, this mostly means investing in things that increase forward-looking productivity – high-speed rail, super-fast public internet access, etc. If America is richer tomorrow than it is today, than transfer programs can either a) grow without affecting the real net incomes of those paying for them or b) can remain at current levels of generosity while simultaneously allowing effective taxes to decline or making more public investment possible. That makes the political economy of the welfare state more sustainable and leads to a virtuous cycle. I don’t think it’s a coincidence that most wealthy nations have generous social safety nets.

Note that this is distinct from the right-wing trope that economic growth automatically benefits the poor because every time GDP grows golden coins rain from the flying limousines of the rich onto the heads of the grateful poor. The key is still in active support networks for the poor and the way that economic growth tends to strengthen them