If they can do the rate of exchange, arbritage against fluctuation and deposit every day, can be very profitable.
Really, when I travel anywhere they almost always take American Wampum.
Only thing I do is check exchange in the morning, except in France they change 2x a day.
I do the calculation with them and they we argue. A bit like negotiating.
You don’t know the rate and what’s fair = pay full price.
Personally, I and the vendors have fun with the give and take and pretending to call each other friend, being a little insulting and then back to friends and the ultimate bluff:
I don’t think we can do business together. That’s too bad. I only have (x) amount of money with me today and I will be spending with someone today. I really wanted that but maybe it’s not meant to be.
Turn and leave and wait for the panicked “Okay, come back...”
It’s a game of who flinches first and everyone has fun.
When I was stationed overseas, there was a foreign national that went door-to-door every day selling the local currency for dollars. He provided a service for anyone that didn’t want to go back on base to make the proper exchange. Old Tony would box the bills up and send them to their Capital city where his accomplice would shop the major banks for a favorable exchange fluctuation the other way. In a place where the per capita income was only a few hundred dollars a year he was able to live well right on the shady edge.
Vendome said: You don’t know the rate and what’s fair = pay full price.
That reminds me...
Q: Why did G-d invent goyim?
A: SOMEbody has to buy retail.
Peet (my memory works weird)