Intershop was a chain of government-owned and operated retail stores in the German Democratic Republic in which only hard currencies could be used to purchase high-quality goods, usually from or associated with Western countries. The East German mark was not accepted as payment. Intershop was originally oriented towards visitors from Western countries, and later became an outlet where East Germans could purchase goods they could not otherwise obtain. An unintended consequence was that ordinary East Germans had some insight into the selection of goods available in the West, which they could then compare with the rather limited offerings available in their own country.

The East German mark, commonly called the eastern mark in West Germany and after reunification), in East Germany only Mark, was the currency of the German Democratic Republic. Its ISO 4217 currency code was DDM. The currency was known officially as the Deutsche Mark from 1948 to 1964, Mark der Deutschen Notenbank from 1964 to 1967, and from 1968 to 1990 as the Mark der DDR. The mark (M) was divided into 100 Pfennig (pf).