Comment by pocksuppet

Fare-charging for public transit has significant frictional overhead. I think in Luxembourg they just made it all free and it didn't cost much money because they didn't need to spend anything on collecting fares. The D-Ticket in Germany too: in some cities, almost everyone has a D-Ticket so the frequency of ticket checks was drastically reduced.

Another counterpoint: if the bus isn't overloaded, taking an additional passenger costs next to nothing, while delivering significant value to the passenger. Don't we want to create as much value as possible?