The growth potential for the idea is immense.
Once all the data are in place, home-shoppers can key in their favourute (branded items) and a personal auto-shopper scans through the prices and picks the best priced items to be consolidated and packaged for collection at each shop by the consumer at the customer service desk (an adaption of the rather soul-less Argos model).
Multiples with low prices get repeat business, enabling them to either take their profit or run 'specials' on fast-moving items with assistance from their suppliers.
Another possibility is that the "over-all best value" trolley of groceries gets delivered free to the consumer once the order is placed with a shop. The personal shopper scans through all the prices and shows all the totals by shop for the shopping-list, makes a recommendation based on all items being in stock with current pricing, displays the 'receipts' to the shopper and allows him/her to make a choice as to where to place the order with the greatest savings, with optional free delivery. Payment processing is for any on-line shop with 'points' allocated to the shoppers loyalty card as appropriate.
There is little different in this scenario than with other price-comparison web-sites for car-insurance, for example.
Whilst the concept is very good yet original I dont think it would work.Who finance's the project?a third party?if so how does a 3rd party make their money?This is only the start.Now on to the nitty gritty stuff.just look at tesco or dunnes.How many products do they sell?How often do prices change?lets just take figroles for example as it was mentioned here somewhere.how many different brands are there,what about other variables such as the item size/weight vs price or even more important promotional packing ie 2for 1 multipackaging where theres special promotional pos on the product that may be on the shelf for a day-2days pending on agreement with suppliers. I dont mean to critisise because its good thinking? I didnt read threw this thread fully but do you not think that if it could be done,It would have been done already?
With car insurance comparison websites variables are alot easier to manage,believe me it is very different.