 In the contemporary debate, this feature or characteristic of goods is usually referred to as “non-rivalry”. A good is rivalrous if and only if an individual’s consumption of it diminishes others’ ability to consume it. Bob’s consumption of a grain of rice makes it impossible for Sally to consume the same grain of rice. By contrast, Sally’s enjoyment of Bruckner’s Symphony No. 9 in no way diminishes Bob’s ability to do the same. Rice is thus rivalrous while music is  not.[1] 