Noticed something very similar. He was a mill owner in the Industrial Revolution, in England, and founded Owen's College (now the University of Manchester) in part to educate his workforce. The theory being that an educated workforce would be able to do better and do more. I don't know if this occured to him or not, but a major problem of the time was worker injuries. People lost limbs or died from workplace accidents all the time. These accidents could have been avoided with greater skill and greater understanding, thus not only saving lives but doing so in a way that the business could profit from.
(Yes, having an intelligent, capable workforce, rather than wage-slaves, can be the superior option.)
I believe that this theory would hold true today in all lines of work. Sure, you don't need to be Einstein to pick up the trash, but a working knowledge of mechanics could make the heavy lifting easier, and outside skills could make the job a little less tedious.
It doesn't require massive brains to handle the checkout counter in a supermarket, but some basics of material science and geometry would help pack things more efficiently, with less risk of damage or breakage.
Sales clerks don't need to be geniuses, but it would help if they knew their products, the psychology of shoppers and economics. They'd be far better equipt to target people who would buy, and be able to produce a convincing reason as to why they should. As it stands, they produce a bunch of techno-waffle in the hope that the consumer will buy to shut them up.
I see absolutely no reason why America should not aim for 75-80% or more of the population graduating from High School, and 50-60% graduating from University with at least one degree. This is very doable, it would require relatively little effort, and the positive impact it would have on the economy as a whole (because people would know what they were doind, and why) would more than pay for the effort.
It won't happen, because there is an initial investment, and Americans are lousy investers. They far prefer to borrow for themselves, even though they must pay back with interest, over investing in others, no matter what the return.