This isn't true in payments. There are many reseller orgs, indie processors, etc. that are happy to negotiate heavily based on volume etc.
Source: I was director of digital marketing for a payments company a few years ago.
Source: I was director of digital marketing for a payments company a few years ago.
Or, to put another way, someone selling handmade goods at a fair using Square will never have more negotiation power than "if you don't like it, leave".
> In practice, [switching vendors] is an extremely weak signal, is swamped out by market changes, assumes zero cost of switching, ignores network effects, etc. One of many reasons why I distrust economist’s assertion of fairness.
https://news.ycombinator.com/item?id=34999021
I'd also pedantically point out that this isn't really a negotiation tactic - negotiation generally involves communication.
"to confer with another so as to arrive at the settlement of some matter"