I was inspired by the book "Make the Bread, Buy the Butter" by Jennifer Reese. I tried to continue the idea to see how much money+time it costs to continually substitute an ingredient for the recipe of that ingredient.
Sorry for the ads - I use them to make back the $ spent on the domain :). I just toned them down.
Please let me know if there are any other suggestions!
Minor suggestions:
* Allow currency change (e.g. EUR instead of USD)
* Use + and - signs or green and red colors when hovering over the ingredients to show if money can be saved or not. Also put the amount of time in a different font size or color. (Site is very minimalist though which is great).
* Explain sources for price calculation (I'm skeptic about some, and curious who its based for).
Not having read the book, I'm guessing it mostly breaks along the lines of perishability? E.g. bread lasts a few weeks, butter lasts a year.
The book is more of a fun read. There's some funny anecdotes about trying to raise bees and chickens.