On progressive taxes: my apologies, i wasn't very clear. Yes I'm familiar with how it works, I just meant raise the bottom tax bracket. EG: first 30k is not taxed.
On economic systems: there are negative trade offs with scale, central planning, vertical integration. Less diverse ideas, can be slower. There are still middlemen just structured differently.
I'm not against publicly owned companies though, they should tend towards infrastructure and natural monopolies (rail, telecom, probably some tech...)
I disagree that it would be easier/more efficient to break up companies than to tax them as they approach that state of need. But I'm not against the idea.
A sales tax as a general term on goods that have negative externalities. That produce pollution, have negative health impacts, use public infrastructure etc.. whole foods, homes at minimum should be exempt. I agree that the poor shouldn't bear the brunt of tax policy changes.
Yes tarrifs getting passed to the consumer is completely the point, to normalize for asymmetrical human rights across the globe. Fair trade, not free trade. Not isolationist either. An elegant way to implement would be based on a democracy index.
The aluminum example is a good one. The consumer in this case is the company importing aluminum. They can buy from an authoritarian country at a 2x tarrif (or whatever), or a democratic country with no tarrif.
But... more of a thought experiment, I think that would be the way from a humanist perspective. But the geopolitics are very challenging.