This isn't just a way to find the slowest employees, this is a way to optimise the performance of all workers. Consider if we have three employees. Person X is

This isn't just a way to find the slowest employees, this is a way to optimise the performance of all workers. Consider if we have three employees. Person X is the fastest, Person Z is the slowest, and Person Y is somewhere in the middle. Consider how management will treat Person Y. For example, both of these sentiments are likely to be used by management to motivate/control Person Y: "Person X is performing at a quicker rate than you, what can we do to close the gap" "Don't be like Person Z or you're at risk of losing your job" If you think that a company like Amazon will do nothing about mediocre performance, you're almost certainly mistaken. To be honest, if these wristbands are introduced at Amazon, I will attempt to completely boycott Amazon until they're removed. I don't work at Amazon (nor do I ever intend to), but in my opinion the wristbands would be a step too far in reducing working conditions, and set a damaging precedent.