Isn't the truth really that those are simply jobs a lot of people can do and hence, don't attract much compensation? I would also wonder if there's a way to dif

Isn't the truth really that those are simply jobs a lot of people can do and hence, don't attract much compensation? I would also wonder if there's a way to differentiate oneself in the market so that a good teacher could improve my salary much beyond that of the mean, than an average teacher.