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Nearly half of shoppers choose their supermarket based on price, a new poll has found.
And of the 38% of consumers who have changed supermarket in the last year, two thirds said they did so because of price.
The survey by Good Morning Britain and OnePoll also revealed that cost is what influences buying habits the most, above quality, offers or reward points.
German low-cost supermarket Lidl has been included in The Grocer magazine's weekly price survey for the first time, which found it sold a basket of common groceries for 29% cheaper than Tesco.
It also came in second for customer service.
Aldi's sales have jumped 32% in the last year, taking its market share to a record 4.8%.
An extra tax on big supermarkets would hit the poorest families hardest, the Government has said.
The Department for Communities and Local Government has rejected calls from 20 local authorities for a new levy on supermarkets to help revitalise local shopping areas.
"Imposing new, additional taxes on supermarkets will push up the price of food and the cost of living, hitting low-income families the hardest," a DCLG spokesman said.
He said there were "much better ways to support small shops".
A coalition of 20 councils is calling for a new levy on big supermarkets to pay for improvements in local shopping areas.
The local authorities say the tax could raise money to help revitalise town centres.
The leader of Derby City Council, which is leading the group, said that life was being "sucked out of the city centre" by big out-of-town stores.
Ranjit Banwait told Radio 4's Today programme the move was a response to "the worst cuts in history" to council funding.
A similar levy is in place in Northern Ireland, while in Scotland health services for smoking and drinking-related disease are partly funded by sellers of tobacco and alcohol.
The heads of some of Britain's biggest supermarkets have admitted they regularly ignore sell-by and best-before dates on food they buy for their own families.
Speaking to the Times magazine, the boss of Morrisons, Dalton Phillips, said he preferred to smell food to see whether it was still OK to eat.
The managing director of Waitrose, Mark Price, said he regularly ate food such as bacon, eggs and vegetables "a day or two after" the use-by date.
The head of the Co-Op's food business, Steve Murrells said: “If you’ve got food in the fridge, and it’s one day past its sell-by date, it’s fine.”
The British High Street has "the most competitive food landscape for some time," according to retail mogul Sir Philip Green.
The businessman was under no illusions about how competitive food retail had become in the UK.
There's no point in opening up and getting torn apart because we haven't got competitive prices.
We know what we're going into - the most competitive food landscape for some time.
On the basis that everyone is going into the high street and convenience, maybe it's an opportunity. If you don't buy a ticket, you can't win the lottery.
Billionaire Sir Philip Green will reportedly use BHS to start selling discounted food in a bid to join the supermarket price wars.
The retail mogul told the Sunday Times the branded goods sold at BHS department stores would be around 10% cheaper than those from Tesco, Asda, Sainsbury's and Morrisons.
Sir Philip, who owns a number of the High Street's big names including Topshop, wants to take on cut price food retailers like Aldi and Lidl.
BHS is to see its first two shops to offer food, in Staines and Warrington, within days, - with plans for about 140 such outlets.
The openings will reportedly see sections of stores set aside for branded products such as bread and cakes, frozen items and soft drinks.