I guess this shows how much of a commodity video lectures are. It's difficult to know the quality in advance of watching a video. Teaching is a market for lemo

I guess this shows how much of a commodity video lectures are. It's difficult to know the quality in advance of watching a video. Teaching is a market for lemons. Worse, the student who buys a lemon will often not realize it, nor the employer who hires the lemon-trained student. Most of the videos listed here are from reputable institutions. I guess we're lucky that the lemon-sellers are trying to profit from their videos.