This action targets those people that have been using credit cards as a way to purchase at the official rate rather than the black market rate, in effect creating a dual credit card exchange regime.

FORBES: Argentina Begins Tracking All Credit Cards

In Zimbabwe, the black-market exchange rate is nearly ten times the official one.

ECONOMIST: Zimbabwe

With hyperinflation, a gap of around 10:1 has opened up between the official exchange rate operated by the bank and the true rate reflected in the black market.

ECONOMIST: How to prop up the government