Great supply and demand starter cartoons.
The first cartoon gives an opportunity for an important teaching point - in the vast majority of cases drawing a supply OR a demand curve in an essay is not enough. Any point that is worth making usually comes from the interaction of supply AND demand.
The second cartoon probably won’t display fully as it is “widescreen” but downloading it will mean that you should get the full version.
Both are from the Non Sequitur range and can be found here