When I was studying for my first degree at university, the hardest essay I was ever set in the whole three years was “Explain the competing theories about capital in no more than 500 words.” To give you an idea of what that means, 500 words is approximately a side of A4 – not exactly loads of space to summarise what has taken scores of economists and thousands of trees. In this, the third part of this mini-series, I explore how you might use this “less is more” approach in school.