have the opposite effect: savings of many people were wiped out, the currency experienced unprecedently heavy inflation that peaked at 774.7% in 1986 and prices skyrocketed. For example, in 1986, the price of agricultural products increased by 2000% compared to ten years before. To aggravate this problem, the government banned all forms of non-state-owned internal trade, which they believed to be capitalistic, resulting in an economic crisis so severe that Tố Hữu referred to it as a "vertical downturn". Despite the inflation rates having stabilised as part of the Đổi Mới reforms, especially during the 1990s and early 2000s, the effects of the crisis still last in the value of the dong, one of the lowest in the world today. Coins First dong In 1978, aluminium coins dated 1976 were introduced in denominations of 1, 2 and 5 hao, as well as 1 dong. The coins were minted by the Berlin Mint in the German Democratic Republic and bear the state crest on the obverse and denomination on the reverse. Due to the chronic inflation experienced by Vietnam during the 1980s and 1990s, these coins lost all their relevant value and no coins were circulated for many years after this series. Second dong Commemorative issues Commemorative coins in copper, brass, copper-nickel, silver, and gold have been issued since 1986, but none of these have ever been used in circulation. 2003 issue The State Bank of Vietnam resumed issuing coins on December 17, 2003. The new coins, minted by the Mint of Finland, were in denominations of 200, 500, 1,000, 2,000, and 5,000 dong in either nickel-clad steel or brass-clad steel. Prior to its reintroduction, Vietnamese consumers had to exchange banknotes for tokens with a clerk before purchasing goods from vending machines. This was also to help the state ease the cost of producing large quantities of small denomination banknotes, which tended to wear easily. Many residents expressed excitement at seeing coins reappear after many years, as well as concern for the limited usefulness of the 200 dong coins due to ongoing inflationary pressures. Since the launch of the 2003 coin series, the State Bank has had some difficulties with making the acceptance of coins universal despite the partial discontinuation of smaller notes, to the point of some banks refusing coin cash deposits or the cashing in of large numbers of coins. This has prompted laws requiring private and municipal banks