We have been enjoying a lively dialogue on Twitter in recent days about a spate of poorly drafted and frankly shoddy diagrams in the AQA-endorsed A2 textbook from the publishers Nelson Thornes. Have you purchased this either as a student or as a teacher for your department? How did the following diagrams manage to make it through the editing process? Can your students spot the mistakes / errors / inaccuracies? If you have worked your way through a sizeable chunk of theory of the firm, this might make for a good exercise along the lines of our "Beat the Teacher" activities!

Exhibit 1: Focus on the diagram

Exhibit 2: Revenues?

Exhibit 3: Interesting shape to the short run average total costs here!

Exhibit 4: It gets better!

Exhibit 5: Long run average variable cost? Price = + 25% ??

Exhibit 6: ATC curvetakes some believing!

Exhibit 7: Price discrimination - what is wrong about the combined diagram on the right?

The offending publication

BTW Tutor2u is mentioned in the acknowledgements at the start of the A2 book (and for the AS version too) - it is a long story and we cannot go into the reasons here. Safe to say that we did not want to be mentioned when the book was first issued.