This thread is about when an equipment upgrade is justified, didn’t recognize at the time it’s about being 'at the margin"
Another is the “swing meter”
Nobody told this guy he didn’t need a swing meter because he could just eyeball it. Evidently when pushing barges up the river it good to be able to see subtle changes in rate of turn. Who am I to say that’s not the case?
Here’s a post using the same concept but in a different context.
"But in a sense it doesn’t even matter what the reason is; the high prices are telling you that California is perceived as a very desirable place to live, at the margin."