The supply of drivers is somewhat fungible, but it doesn't just multiply when demand is high and shrink when it is low. Those are Human beings that have to be,

The supply of drivers is somewhat fungible, but it doesn't just multiply when demand is high and shrink when it is low. Those are Human beings that have to be, in essence, "stolen away" from another job, in the case of high school graduates (or whatever you call them) from another potential career. That's why wage isn't the magic wand many people believe it to be. If one industry increases wages (provided they can afford it), another gets the short stick. Unless you "steal" workers from other countries. As the UK did/does successfully for example with health workers...