alt Hacker News> Capital makes the marginal worker more productive, not less. You can tax the worker and she will still be better off than if you had taxed the capital, due to greater productivity.
Point one: higher productivity is not necessarily our goal. I could think of numerous industries that would make the world better if they did less work.
Point two: There's a moral absurdity in taxing the wages earned by labor more heavily than the returns earned by ownership. One is tangible effort, the other is an abstraction backed by law. If anything, taxing capital should be the baseline, because it's the least tied to survival. Historically, when America was at its most broadly prosperous, capital gains and corporate profits were taxed at far higher rates than today.
Point three: AI intensifies that calculus. If AI is deployed by capital to further replace or devalue labor, then taxing only the worker is punishing the displaced while rewarding the displacer. That's pure extraction. If we want social systems to survive, the burden has to fall on the owners of the machines, not the people being replaced by them.
Genuinely one of the largest and most destructive ills of our society right now is that so tremendously more of our shared prosperity as a system is directed to those who do the least to create it.
It's both. You don't want to tax capital and income. VAT and sale tax are a bad idea too, especially since they're regressive.
So, what do you tax? You tax land and land-like things, non-reproducible privileges(like patents and copyright), pollution and other negative externality.
Now, there's an argument to be made that we couldn't possibly be able to fund governments on the back of these taxes. Fair enough, but it should mean we minimize those taxes until the economy grows enough to fund government services.