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* Zimbabwe ends dollarisation after decade
* Interim RTGS unit now sole legal tender
* Mnangagwa says move part of recovery plan
* Business wary after Mugabe's interventions
* Union grouping threatens mass action (Writes through after Mnangagwa comments)
HARARE, June 25 (Reuters) - Zimbabwe's President Emmerson Mnangagwa said on Tuesday that a decision to ban the use of foreign currencies was an important step to repair the economy, but local businesspeople and investors were wary a day after the reform was announced.
Mnangagwa, who replaced longtime leader Robert Mugabe after an army coup in November 2017, is trying to attract investment and lift growth after a litany of failed economic interventions under his predecessor.
His government said on Monday the country's interim RTGS dollar would be the only legal tender, ending a decade during which multiple currencies including the U.S. dollar had been accepted in shops.
But the surprise manner in which the latest currency reform was announced, and Zimbabwe's track record of printing money to plug holes in its public finances, mean many people do not believe it will succeed.
With inflation close to 100% last month and desperate levels of unemployment, Zimbabweans are impatient for progress. Unions are threatening strikes if the government does not overturn its policy.
"It has always been clear that for our economy to truly take off, we need our own currency," Mnangagwa said in a statement.
"While the multi-currency regime helped stabilize the economy, it did not give us control of monetary policy and left us at the mercy of U.S. dollar pricing which has been a root cause of inflation."
In the capital Harare, major grocery and fast food chains appeared to heed the directive to stop accepting foreign currencies, but some informal traders selling clothes, car parts and electronics vowed to defy the new rules.
"If I stop taking U.S. dollars, how am I going to replace my stock? I have not seen anyone who got U.S. dollars from the bank in a long time," said a clothes seller who only wished to give his first name, Thomas.
The RTGS firmed slightly on the black market on Tuesday, but exchange rates were quoted in a wide range, between 7 and 11 to the U.S. dollar compared with between 11 and 12 on Monday, reflecting uncertainty about how the reform would pan out.
Traders attributed the generally firmer rate to tight availability of the RTGS a day after the central bank hiked its overnight lending rate to 50% from 15% and announced plans to try to curtail RTGS liquidity.
Zimbabwe introduced the RTGS as a transitional unit in February as a step towards relaunching the Zimbabwean dollar.
The Zimbabwe Stock Exchange's industrial index fell 0.7% on Tuesday, breaking a sustained rally. Volumes were thinner, with shares worth 4.3 million RTGS traded on Tuesday, down from 32 million RTGS on Monday.
One sign Zimbabweans are distrustful of the RTGS is that it is weaker on the black market than on the official interbank market, where it trades around 6 to the dollar.
Analysts are skeptical that Zimbabweans and local firms will sell foreign currency to buy RTGS, as the government wants them to, unless they are forced.
They point out that Zimbabwe has few foreign-currency reserves with which to defend the RTGS.
The country's largest labor body and the main opposition party, the MDC Alliance, sharply criticized the decision to switch to using the RTGS as the country's sole currency.
"If the government does not reverse this ruinous policy immediately and announce U.S. dollar salary payments, we will immediately mobilize workers for mass action," Zimbabwe Congress of Trade Unions (ZCTU) president Peter Mutasa told reporters.
The ZCTU - which groups teachers, factory workers, mine workers, farmhands and others - led protests against a 150% fuel price increase in January, triggering a violent crackdown by the army and police that left at least 12 people dead, according to rights groups.
The MDC's head of policy and research, Tapiwa Mashakada, said the currency reform would exacerbate widespread shortages of critical goods.
"The wheels have finally come off as the Zimbabwe government has been cornered and forced to involuntarily de-dollarise without a plan," Mashakada said. "At present Zimbabwe cannot afford a paper currency which has no economic value."
(Writing by Alexander Winning; Editing by Angus MacSwan and Alison Williams)