Cuba e o dólar

Um exemplo de dupla circulação de uma moeda forte e uma moeda nacional fraca:

In 1993 the Cuban Government made it legal for its people to possess and use the U.S. dollar. From then until 2004, the dollar became a major currency. To capture the hard currency flowing into the island through tourism and remittances - estimated at $500-800 million annually - the government set up state-run "dollar stores" throughout Cuba that sold 'luxury' food, household, and clothing items, compared with basic necessities, which were bought using the Cuban peso. As such, a gap in the standard of living developed between those with access to dollars and those without. Jobs that could earn dollar salaries or tips from foreign businesses and tourists became highly desirable. It was common to meet doctors, engineers, scientists, and other professionals working in restaurants or as taxi drivers.