Exactly, Ford was an industrialist, he manufactured which required a skilled labor force, and the price of constant turnover was killing the business because of the training time.
You can't apply the same principles to no or low skilled workers, it simply does not compute, because there is practically no training investment. And what's really funny, today's minimum wage workers would have a shit fit if an employer demanded a simple drug test, imagine if any employer wanted to inspect their home for wholesomeness.
So let's clear up some misconceptions...
Walmart is not some great evil. It is just a retail chain. There's a wonderful Penn&Teller episode I would recommend. Nor is Walmart governed by some infallible "job-creator" supermen. It is just a retail chain taking advantage of arbitrage.
Walmart does require a drug test as a condition of employment. There is some training involved, as with any employment. The amount of training would depend on the specific job requirements. Walmart does invest employees, and even seeks to integrate low paid immigrants into American society. For example, Walmart participates in Workplace ESL classrooms.
Walmart suffers a 70% turnover rate in the first year of employment, and this is obviously a loss.
It is the transient nature of arbitrage that limits the lifespan of Walmart, not the 70% turnover rate.
When profits are high, it is easy to overlook inefficiencies in the system. As profits decrease, we may then start to see Walmart get serious about reducing the turnover rate.
First thing you shouldn't use terms you really don't understand. If Walmart were truly engaged in arbitrage they would have no need for their massive regional warehouses.
As far as the drug test comment I was thinking more of the fast food folks, not Walmart.