This is currently happening in Venezuela. It is a fascinating economic topic (for the economists here, a good idea for a paper). The historical, low-trust,cut-throat, highly-volatile economic environment in the country , compounded with the absence of an official backing local institution for the US dollar plus the common people ignorance of the value abroad of the dollar is producing the following funny(?) or curious conditions:

- Most big and small businesses will accept the dollar (this was not very common before Maduro) but only in crisp,immaculate bills of 20 USD or above.

- The people you usually give small tips (think the kid who bags your shopping in some supermarkets ) actually get offended if you give them 1-2 bucks.This in a country were the average monthly "salary" is around 10 bucks.

- Some business may take your low denomination bills but with a big fee (10%-20%).

- Prices of goods and services in dollars are absurd. Say, a haircut maybe is 10 cents, but now a plumber wants to charge you 150 bucks just for a "consultation" visit. A dermatologist instead may charge you $30 the consult in a private place and a cardio-toraxic surgeon in a public hospital has a 20 USD/month salary.

- People are importing things like 12 oz Nutella jars and selling them at 20-30 USD, because it has become a luxurious item of conspicuous consumption, as if it were Beluga caviar.

I am pretty sure there is more, but it is getting too depressing (no pun intended)