The fight for customers is driving fast-food prices lower, but industry associations say it is unsustainable.
Burger King is currently offering a 9-pack of chicken nuggets for $2.95 and a cheeseburger 'Stunner Meal' for $5, while competitor McDonald's offers a cheeseburger and chips option for $4, and KFC a $3.90 snack box.
First Retail Group managing director Chris Wilkinson said fast-food operators were moving away from using occasional promotions.
"Moving away from occasional promotions to the concept of everyday better pricing is definitely an aspiration — but not always achievable or sustainable, when competitors retain dynamic pricing models that are influenced by market-share, seasonality and other factors," Wilkinson said.
"Fast food operators tend to use 'door-buster' deals to drive up traffic and sales when making a play for off-peak-spending or market share. A good example of this is the price promotion quick-service restaurants are doing around lunchtimes — which is becoming an increasingly crowded marketplace."