Of those questioned, 73 per cent said they now function as wholesalers as well as retailers.
The survey only involved businesses whose primary focus is selling direct to the public, but of those who wholesale, 25.3 per cent of turnover is now derived from that activity.
The figure looks set to rise in the coming year. Of those businesses which do not currently engage in wholesaling, 7 per cent say they have plans to start, while a further 4 per cent are undecided.
"My gut feeling is that the figure is growing," said OLN consulting editor Graham Holter.
"I wouldn't be surprised if next year it was nearer the 80 per cent mark."