Originally Posted by
reclusive46
I don't know about the US but they've had a 0 floor limit for a few years in the UK now, so for a retailer to be guaranteed funds they have to call up for every single transaction.
I don't know but I'm pretty sure some floor limit is allowed when authorisation isn't feasible. For example, I used a Visa card in Glacier National Park last week - a long ways from any phone/internet/mobile service and the transaction was offline. Swipe card, sign receipt, done. No authorisation and no way authorisation would've been possible.
Afterwards, I wished I'd tried my Bluebird card just to see if they'd have taken it which DOES have zero floor limit and it clearly says so on the card.