Fiver Friday is Liveline's RTÉ Radio 1 campaign to help support local businesses and Joe Duffy has launched a special festive edition.
Speaking to RTÉ TEN, he said: "It's the simplest idea in the world, spend an extra €5 locally, December 6 is the day all around the country in shops, services, hotels, pubs, butchers, bakers, candlestick makers are all offering special deals for a €5."
He added: "My local set of shops in Clontarf has a butchers, bakers, a brilliant café, brilliant florist, a great chemist – it has everything you'd ever need.
"All of them are doing special deals coming up to Christmas for the festive Fiver Friday on December 6."
Stay tuned to Liveline on RTÉ Radio 1, 88-90fm or via the RTÉ Radio Player, weekdays 1.45pm to 3pm