This books covers Unit 1 of the AS Edexcel Economics examination, the microeconomics paper. I bought it for the content guidance, although at the beginning it has advice, and at the end questions and comments on sample exam papers. The content guidance was very good, each theory is summarised and explained, condensed down enough to meet specification requirements without being too short to miss anything out, and there are advantages and disadvantages listed where needed to get you the evaluation marks in the paper. There is one negative point however which is one error I've noticed, which is the exclusion of a National Minimum Wage diagram, which you need to know. But this can be obtained from other sources. Overall though, it is clear and a good summary of the whole of Unit 1 and would highly recommend it for revision.