The cost: Dublin Chamber of Commerce has estimated that as much as €10 million was lost by businesses through closures and damage as a result of the riots.
Several shopfronts were smashed by paving slabs which had been set aside for O'Connell Street's reconstruction.
Shops which sustained the most damage were forced to remain closed yesterday.
It is not known if any claims will be made against the council for damage caused by the use of materials left at the O'Connell Street site during Saturday afternoon's riot.
However, Dublin Chamber of Commerce and the Small Firms' Association say that millions will have been lost to businesses.
"We don't yet know the full extent of the loss of sales, but we're also concerned about the image of Dublin these events have given. Substantial investment has gone into the St Patrick's Day Festival and the Easter Parade, and the organisers will be hugely disappointed with how Dublin is being portrayed," said Pat Delaney, of the Small Firms' Association.
He said that Dublin businesses generated about €19 million an hour, and an additional €40 million should have been spent in Dublin this weekend as a result of the Ireland versus Wales rugby international.
"We don't know yet what extra losses will have been incurred there, but it's very clear there will be losses," he added.
Torlach Denihan, director of Retail Ireland, the section of the Irish Business and Employers' Confederation which represents the retail sector, said it was difficult to quantify at this stage the exact cost of the damage caused by the rioters.
"We estimate that the loss of sales by retailers as a result of the riots is in the region of €10 million. Besides the immediate cost to businesses and individuals directly affected, street violence of this sort damages the reputation of the city right across the island and overseas."
Gardaí issued no prior instructions that the building materials used in Saturday's riots should have been removed from O'Connell Street, Dublin City Council has said.
The council said it and SIAC had several meetings with senior gardaí in advance of the planned loyalist march and were not told to remove any paving stones or construction equipment.
When gardaí approached the council to say that a request had been made to use the street for a march, they had been made aware of the current state of the work programme, including what equipment and materials would be in place, said Charlie Lowe, the council's central area manger.
However, he said, the officers remained confident that it was appropriate for the marchers to use O'Connell Street.
"The gardaí liaised with the council and with SIAC, and in this case they asked for the litter bins to be taken out in case they were set on fire, and they requested the contractors to make the site as secure as they could make it." He said that solid hoarding could not be used to secure the site because fencing needed to be moved around as different sections of the street were completed. However, he added that gardaí had raised no objection to its use.
The council accepted the Garda advice, Mr Lowe said, and left the paving slabs in place.
Clearing the site would have been a "huge task" which could have set back the completion of the work scheduled for May.
Additional fortification of the site might have provoked even greater violence, he said.
"My own view on this is that there was no forewarning that this would happen. The gardaí, to their credit, tried to keep things low-key, and extra attempts to barricade the place might have goaded people."
The clean-up operation, which involved removing broken glass, burnt-out vehicles and other debris from the street, will have cost the council up to €50,000.
However, SIAC has not yet determined what losses were incurred by damage to its materials and equipment. While the paving slabs which were already laid remain largely intact, one excavating machine was overturned and had its windows smashed.
