issued in March 1992, after the Soviet collapse. New 1992-dated notes, similar in appearance to the 1991 issues, were printed in denominations of Rbls 50–1,000. bearing the Soviet state emblem and name. A notable exception was that the more-colourful Rbls 100. note of this series was still dated 1991 unlike the others. After the breakup of the Soviet Union, many newly independent republics chose to continue circulating Soviet rubles even after the introduction of the new Russian ruble in 1992. Economic role The Soviet Union ran a planned economy, where the government controlled prices and the exchange of currency. Thus the Soviet ruble did not function like a currency in a market economy, because mechanisms other than currency, such as centrally planned quotas, controlled the distribution of goods. Consequently, the ruble did not have the utility of a true currency; instead, it more resembled the scrip issued in a truck system. Soviet citizens could freely purchase a set of goods from state shops with rubles, but choice was limited and prices were always political decisions, having no direct connection to manufacturing cost. Bread and public transport were heavily subsidised, but wages were low and there were shortages of manufactured consumer goods, implementing hidden taxes. It was common to hold large savings in rubles in the state savings bank because credit was not available. Special rubles used in accounting were not exchangeable to cash, and were effectively different currency units pegged to the ruble. The currency was not freely exchangeable and its export was illegal. In bilateral trade, a separate, non-convertible "clearing ruble" credit was used. There were separate shops (Beriozka) for purchasing goods obtained with hard currencies. However, Soviet citizens could not legally own foreign currency. Thus, if they legally received payment in foreign currency, they were forced to convert it to Vneshposyltorg cheques at a rate set by the government. These cheques could be spent at a Beriozka. The sudden transformation from a Soviet "non-currency" into a market currency contributed to the economic hardship following the dissolution of the Soviet Union in December 1991. Exchange rates The Soviet Union officially valued the ruble in the planned economy at an average of US$1.35 (or Rbl 0.74 per US dollar; see below) from 1971 to 1988. However, as the ruble was not internationally exchangeable and as Soviet citizens could not legally own foreign currency, rubles changed hands in the black market