Pay in the underground

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It is mandatory to pay in these types of places, because if you do not, it will have several negative consequences, such as: a fine that will almost reach 100€.
In our opinion we see well that you have to pay, because there are many people who work in these establishments, and if we did not pay these employees they could not pay then the underground would gradually disappear and become unusable because of dirt, engine failures, among other things. Also thanks to this money we pay, they make the underground more and more effective and we can travel to more distant places, increase the lines, keep clean and help people who use it every day, etc.