Surely, it can't be equally difficult to obtain juice from different fruits, but surprisingly, they usually cost the same at the store. One exception may be cranberry juice, which is sometimes a little more expensive than the other juices of the same brand (for various reasons, I suppose).
Does the price become the same for most juices of a single brand because of store pricing policy? Do manufacturers set equal price for them? Or is it really almost equally as hard to make the different juices, so the price is basically the same?