I’m an economist. This is an example of a volume discount. Prices often decrease per-unit when buying larger quantities. That happens whether it’s milk or

I’m an economist. This is an example of a volume discount. Prices often decrease per-unit when buying larger quantities. That happens whether it’s milk or the square-footage of an apartment. I’d expect larger files to be worth less per-byte. Photo and video files tend to be larger than text ones.