In that world, every day at lunch and dinner time, lines for pizza restaurants world stretch around the block. No matter how much someone wanted pizza, he had to wait.
Experts began calling this "induced pizza demand."
Pizza policy experts told him, no, that's just the same as widening pizza queues. The pizza tunnels will just fill up.
Diner throughout increased 3, maybe 4% with each change, but the lines never shortened.
But the lure of few pizza was just too much.
This is why analogies are helpful. When the same principal is applied to a different topic, what we've been doing for decades start to make less sense.
If giving away a desired good for free doesn't ever work, why would it work for road space, above or below ground?