same item on sale for 99 cents a can plus i can use coupons.
assumption #2: larger items are usually cheaper per ounce.
false – a great example of this is ketchup. many times when you go the store it seems that it would make sense that the larger ounce ketchup should be cheaper per ounce. however, i find that many times the small ounce ketchup is cheaper (per ounce) than the large ounce ketchup. plus, if you have a coupon for the item, you can buy multiple smaller items, and use multiple coupons saving even more.
assumption #3: store brand is cheaper than name brand.
generally true – it is true that most 