This is the most recent edition (4th revision) of the document, Classification by Broad Economic Categories Defined in Terms of Standard International Trade Classification. It's a publication put out by the United Nations Statistical Division and it explains classifications, by broad economic category, of items such as:commodities, distinguishing food, industrial supplies, capital equipment, consumer durables and consumer non-durables, as they are presented in international trade statistics.
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.