Testing an animation

I never quite got around to putting up my youtube video about information transfer economics, but I'm going to test the gif capability of blogger with a piece of it. Here is a animation of how the "unit of account (information)" and "medium of (information) exchange" relate:

One thing that is not quite correct: at constant N, increasing M should keep the height of the the stack the same by adding more units to it (making them shrink). Otherwise, this is a pretty good picture to have in your head.