> A realistic public transit network can NEVER be as efficient as a car network in a city. It's mathematically impossible, unless you sabotage your city so much, it's a hellscape (e.g. Manhattan).

If you have a city without any mass transit, there will be traffic congestion. Beating the "stuck in traffic" time for a car is not hard at all. Beating the car's time when there is no traffic is harder, but an express train can certainly match it, and anyway how do you intend on preventing traffic congestion in a city with no mass transit?

> Price is a GREAT signal.

Price is a great signal for incremental costs. If you're going to burn a gallon of gas, another gallon of gas has to be produced, so you only want it to happen if someone is willing to pay the incremental cost.

It works poorly for fixed costs, because the price then deters usage even though the fixed cost is fixed and deterring usage saves nothing. This is why you should charge for gas but not for roads or for occupying otherwise-empty space on a subway car.

> You basically have a circular argument: transit is needed because it allows density, and density is good because it allows transit. And since we need transit, it must be cheap.

The argument is that transit is good because it allows density and density is good because it makes more efficient use of a scarce resource (land).

> People will adapt and start to move out office space out of Downtowns.

The buildings in the downtowns are not going to cease to exist. Something is going to be in them.

> And yes, this can work even at a gargantuan scale. Greater Houston Area has comparable population to New York City, yet it has faster commutes and far better living conditions.

Houston Metro has a population around 8M. NYC metro is 20M, is the largest in the US, and the NYC government has been corrupt and incompetent for decades.

In particular, one of the things Houston does well is to have less restrictive zoning than most other cities, which allows for mixed-use construction that in turn lets people live closer to where they work. But that's something that helps regardless of what you're using for transit.

Moreover, the level of traffic in Houston is not good. In spite of their zoning advantage their average commute is worse than the national average.

> Ideally, though, cities should stay reasonably small. 300k seems to be the sweet spot from the efficiency standpoint.

There is nobody dictating how many people will live in a city nor should there be. You can tell from the geography of the continent that a city in the position of New York is going to be a massive port, and so it is. Houston, Los Angeles, San Francisco and Chicago are big cities for the same reason. Nevada is mostly desert so Nevada is mostly empty; Las Vegas metro was created from the combination of cheap power from Hoover Dam and proximity to California with legal gambling and it's three quarters of the state population. Inland states are disproportionately farmland.

You don't get to decide where the beachfront property is. The question is only, given that 38M people live in California, how are they supposed to get around?

> Research shows that more transit use does NOT decrease traffic, except in very narrow cases (on arterials immediately parrallel to fast transit).

That's where the traffic congestion is!

> Moreover, over time it leads to MORE traffic, as transit brings in density, and density results in more traffic.

This is the BS "induced demand" theory. What it's really describing is that if you have an otherwise desirable area (e.g. it's within an hour of the ocean) but the local government is mismanaging the area so it's full of traffic congestion or crime or excessive bureaucracy or whatever else, and you do anything whatsoever to make it not suck as much, more people are going to move there.

Fixing the problem doesn't induce demand, the demand was there the whole time and was being suppressed by mismanagement. And you get the same result from anything that fixes the problem. The only way to prevent more people from moving in there is to keep the place a hellscape so people don't want to move in.

Compare this to building a subway in Wyoming where nobody lives and the presence of a subway is obviously not going to cause a population boom there, which is what would happen if "induced demand" was actually a thing.

> I'm OK with giving poor people money so they can THEMSELVES decide on what they can use it, instead of trying to social engineer them by giving them "free" rides. When each ride costs $20 just in op-ex (true cost for Seattle, btw).

The issue is that $20 is the amortized cost, not the incremental cost. The bus costs the same to run whether it has 5 people on it or 40, but if it has 40 then the cost per passenger is 8 times less. And if it currently has 10, the incremental cost of making it 11 -- or 30 -- is zero, so that's what you want the fare to be. Which would in turn cause more people to take the bus and lower the cost per passenger.

> Richer people should pay the full cost of rides.

The incremental cost is still zero regardless of your income level.

> This also applies to cars (although in my state car user fees already pay for 98% of all road maintenance and construction).

It does also apply to cars, but we usually get it right for cars -- the roads (i.e. the fixed cost) are free but you pay for your own gas.

> That's exactly what transit is achieving. It keeps people trapped in poverty, by reducing their economic choices.

The proposal is that you'd have free mass transit, paid for by taxes, which are predominantly paid by rich people. There is nothing prohibiting you from buying a car, which would cost the same as it does now, all it does is make one of your options less expensive than it is now.

Reducing your choices can only come from making one worse than it is now, so that it takes that option off the table. Making an alternative cheaper or more convenient can't do that -- you still have the option to do the other thing and then only reason you wouldn't is if the new option is going to make you better off than the status quo which is still available.