To calculate the overall star rating and percentage breakdown by star, we do not use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
I like Tim Harford, but he kinda says the same thing a lot of times in a slightly different ways in the first two thirds of this book. Maybe the last thrid livens up, but I'm not sure I'm going to get to the goodness off it. I think people whose day job is writing books produce better journalism than journalists do books. I imagine they are equally disappointed with the end product; although maybe the former puts in a bit more effort.