Falling naira prompts Nigerian currency controls
22 January 2016 Last updated at 12:28 GMT
With the price of oil languishing around $30 (£21) a barrel, the Nigerian naira has dropped to record lows and the country's foreign exchange reserves have been dwindling for some time.
This has prompted the authorities to start a series of controls designed to stop dollars fleeing the country.
But are they working? And what has been the effect on businesses? The BBC's Ijeoma Ndukwe reports from Lagos for Africa Business Report.