Why Don't We Teach Photographers What to Charge for Their Photos?

I've heard countless versions of the same story: a photo assistant discovering that the photographer charged the client double what they paid the assistant in regards to the assistant fee on the client's invoice, a tragic problem frequently encountered and rarely remedied. When I first began photo assisting, I was massively underselling myself without realizing, and people took significant advantage - it was only when another female photographer pulled me aside and told me what my rates should b...