Customer Reviews, including Product Star Ratings help customers to learn more about the product and decide whether it is the right product for them.
To calculate the overall star rating and percentage breakdown by star, we don’t 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 analyzed reviews to verify trustworthiness.
This book is often thought-provoking, but ultimately too shallow. Too many of its conclusions are just stated without enough justification. Although not quite as quick to read, Stiglitz' "Globalization and its discontents" goes much deeper and has a more balanced point of view.