Only one data point but the local Amazon warehouse I worked at for a while has a Target warehouse about a mile away that pays ~20% more for similar work. People were leaving for them in droves, including management.
I'm sure the competitiveness varies wildly in different areas though.
There's something to be said for poaching workers your competition has trained already.
The downside, especially for the managers, is that they bring their toxic attitudes with them. Diluted of course, but removing it entirely would be a huge effort.
I'm sure the competitiveness varies wildly in different areas though.