Startup Idea : Shopping Genius

This is an app to help with grocery shopping. An app that allows you to list all the potential items you need to buy from a supermarket. I know there are many like this. But the difference here is, that, there will be tie up with different supermarkets. The shopping carts at the supermarket will have an attached screen with a bluetooth or NFC function. Once the shopper reaches the supermarket, he/she can tap her phone on to screen on the cart which instantly will transfer all the items to the cart screen. The screen will direct the shopper to the preferred route around the supermarket to find the items he/she requires as well as show special offers on the products she/he chose plus show other products that are on offer that matches her list. This needs to be combined with other systems within the supermarket to help.