Sinn Fein has said the DUP is wrong to blame the Brexit Protocol for some goods not getting into Northern Ireland.
Chris Hazzard MP said the appearance of empty shelves in some supermarkets was down to the UK Government not allowing businesses enough time to prepare for "the biggest rupture in trading procedures in decades".
He said the resulting "trading adjustment shock" meant many businesses in Great Britain have found themselves having to use these first few weeks in January trying to get up to speed.
Mr Hazzard said the DUP was wrong to suggest the problem was the fault of the NI Protocol or unique to Northern Ireland as there was disruption at GB ports.
"Indeed, a British Government spokesperson acknowledged that the flow of goods between Britain and the north of Ireland has been generally "smooth" and the arrival of freight "continuing to increase substantially" as the last week has progressed," he added.