[realschool]

Dan Ariely has made an app that does something like this, although instead of looking at the number of hours it takes to pay for something he compares it to what alternatives you could buy, so if you like coffee and you want to book a book you see how many coffees you would have to give up to get the book, similar but equally interesting concept. You can see his app here, its the first one Oranges2Apples http://danariely.com/apps-tools/