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Notes -
I think the induced demand idea comes from the observation that while travel times for things like trains are fairly stiff as utilization approaches capacity, roads tend to see a large increase in travel times when approaching capacity. I don't think it's aptly described by induced demand, but it is likely rather frustrating that an increase in capacity is just that, with no decrease in travel times. This is an especially bitter truth because the total throughput may be maximised at less than full capacity.
Yeah. If the only cost one pays to drive is in travel time, and more people want to use the road at 0 congestion than can, congestion will be the 'price' that rises until the market clears. And if the supply curve is X people can use the road at 0 congestion, but X * 1.05 people can use the road at high congestion ... if the demand curve is in the wrong place, everyone can end up with high congestion. But this isn't a "distributive effect" as it'd be if it was a toll price extracting surplus value, because nobody's "getting" the lost time to congestion, it's just burned.
I'm not entirely sure what a 'full capacity but not max throughput' road looks like? (genuine question as opposed to rhetorical)
I wouldn't be surprised if past a certain point congestion decreased capacity.
A traffic jam.
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