The folks over at NPR make a compelling argument about why you should always buy the biggest pizza, see http://www.npr.org/blogs/money.....gger-pizza
The current Guinness World Record holder is a 54" x 54" pizza from a California pizzeria that will serve 50-70 people. http://bigmamaspizza.com/images/gianscilian.jpg
If you live in the Los Angeles area and want to order one, I guess you're in luck!
(Yes, they have a 54" box and can deliver it!)
But should you apply that to everything? I'm sure that we'd all like to get the most for our money, but unless you can actually use all you buy, I think you may be wasting your money in some cases. If you shop with coupons, it usually makes more good budget sense to use your coupons on the smallest size. If you can double or triple the coupons and catch items on sale, you likely will get those products for free.
When it comes to eggs, there's a popular formula. If the price difference is less than 5-cents per dozen, you should buy the larger size. If it's greater than 5-cents, buy the smaller size. If you can use milk by the gallon, it's a better buy than the smaller sizes. But not if you can't finish it by the expiration date.
So how do you save? What size for what items do you buy?