Shopping list and todo manager could be different application - why?

Well, good shopping list should include:
- gps - should be related to location and time
- should include what should you buy but also where have you bought them before and what price
- shopping list should also have infrmation how many days you can survice with out this product and it should "calculate" how many days you can be without shopping - this saves quite much of everyone time
- shopping list should also have have connection to your wifes or other family members shopping lists so that you could organize them together

All of us actually buys quite a few things (not more than 100) and every product has some kind of time frame. By knowing these time frames or at least knowing them from ten most popular products you can actually make life much easier and save really much time when program could actually optimize these time frames with each other.