Final answer:
The characteristic of money that labels it as a generalized reinforcer is Acceptability due to its wide acceptance as a medium of exchange.
Step-by-step explanation:
The characteristic of money that is responsible for it being labeled as a generalized reinforcer is Acceptability. Money functions effectively as a medium of exchange because it is widely accepted by people for the purchase or sale of goods and services. The characteristic of money that labels it as a generalized reinforcer is Acceptability due to its wide acceptance as a medium of exchange. This universal acceptability is what makes money so flexible and capable of being exchanged for a variety of goods and services, unlike special-purpose money, which is more limited in its use. Durability, portability, and divisibility are also important characteristics of money, but acceptability is the key feature that ensures its role as a generalized reinforcer.