To improve mass transit, e.g., high-speed rail or buses or subways, should one increase the range or increase the frequency? It's always politically popular to increase range (more population served). This can be measured, but I suspect it's nonlinear: a dramatic change at threshold frequency (maybe once every 20 minutes?) when people don't have to schedule their lives around the availability of transit, much like owning a car.
Experiments and measurements are very difficult as people make housing and car purchase decisions on a timescale of decades.
Also consider increasing speed, though that may require technological improvement.
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