We want to solve problem specific to people who shop at supermarket or any other store where customer buys several items.
Let's say one of your family member or a room mate went to supermarket for their own purpose to buy something they need then you'll get notification in your mobile saying that this person has gone to supermarket and will allow you to add your items to their shopping list.

So here you're going on your purpose but it allows your ppl to add their items to your list so it's no big deal to buy for them along the way.
We can include transactions from app itself and we can include the availability of items.