Iran's central bank is allowing most importers to buy local currency at half the former official price as part of attempts to attract investors to an economy battered by Western sanctions.
The effective devaluation of the Iranian rial comes as other proposals are being floated to boost commerce, including possibly waiving taxes for foreign companies.
Sanctions over Iran's nuclear program have hit the country's vital oil exports and blocked transactions on international banking networks. Inflation is running at more than 25 percent.
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The unofficial street rate, however, remains considerably higher, at about 33,000 rials per US dollar.