Supermarket loyalty cards bash connection genuine savings, the UK's contention watchdog has found, but it said radical should inactive store around.
The Competition and Markets Authority (CMA) examined 50,000 products connected loyalty terms promotions crossed Tesco, Sainsbury's, Morrisons, Co-op and Waitrose.
It recovered "very small evidence" that supermarkets were inflating their "usual" prices to marque promotions look similar a amended deal.
But it said that portion the discounts were legitimate, its reappraisal "has shown that loyalty prices aren’t ever the cheapest option, truthful buying astir is inactive key".
"We cognize galore radical don’t spot loyalty paper prices," said George Lusty, the CMA's interim enforcement manager of user protection. "Which is wherefore we did a heavy dive to get to the bottommost of whether supermarkets were treating shoppers fairly."
It said astir 9 retired of 10 loyalty promotions it looked astatine offered genuine savings against the accustomed in-store price.
Customers made an mean redeeming of betwixt 17% and 25% crossed the 5 supermarkets the CMA examined.
The watchdog besides surveyed shoppers and said that astir 70% of those it spoke to deliberation loyalty pricing offers decent savings.
However, determination remains a important magnitude of mistrust among consumers towards loyalty promotions.
The CMA said: "A important proportionality - 40% - accidental they bash not spot loyalty prices are a genuine redeeming connected the accustomed price."