Goods (and services) from which is it easy to exclude potential consumers. Consumption is subtractive (what one person consumes is no longer available for others) and potentially rivalrous.
goods and services that have a recognised market where they can be exchanged at agreed prices and where consumption of them by one prevents consumption by another
A commodity that benefits the individual. An example is bread, which, if consumed by one person, cannot be consumed by another person. (See public goods.)