Why does 1l bottle of Coke cost more than the 2 litre one?

It's a shopping sales gimmick, they put stuff that's more expensive, in the front of the store usually the smaller bottles and make them expensive, because they know people aren't going to walk to the back of the store, or down another isle just to get something to drink. They do the same thing with candy, candy bars are usually a dollar while the candy in the candy isle are $3 and have more candy.