Comment by AnthonyMouse

> Neoclassical economics recognizes, under the standard macro model, that labor taxation is second best. The first-best is capital taxation, once and for all time

Tariffs (or, more generically, consumption taxes) are effectively both. If something is sold, the money is going to some combination of labor and capital, and then the tax is paid either way. Tariffs in particular also create a preference for domestic production, which increases domestic labor demand at the cost of lower economic efficiency and higher prices, which is the primary thing that makes them dumb if you're not a fan of taking that trade off.

In theory the primary disadvantage to consumption taxes is that unless you want to track all of everyone's consumption, it's hard to apply a progressive rate structure. But in practice there is a way to do that -- provide a universal tax credit in a fixed amount. Then everyone pays a uniform marginal rate, lower income people receive e.g. a $10,000 credit and pay $5000 in taxes (which also obviates the need for $5000 in social assistance programs), and middle and upper income people get the same $10,000 credit but pay more in tax.