Zimbabwe clamps down on black market trading it blames for devaluing its new ZiG local currency.
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Businesses, transport, government services reject old notes despite the unavailability of new bills until end of month.
The increase this year, driven by geopolitical tensions and supply shocks, could hamper efforts to rein in inflation.
Zimbabweans have 21 days to convert their old cash into new money, according to the central bank.