The soviet government in the 1980’s never abandoned the ruble as the official currency. however, the people of moscow preferred to accept

goods like American dollars or cigarettes in exchange for services or other rights. So, it is clear to see that it needs more than a government decree to validate money, like social agreements  or expectations

Explanation: since cigarettes were hard to find and in the future will be something that people want; everyone preferred to take these in exchange for services or other goods, something like a trade.

answer: intercourse

hope this