Using points and examples from the talk, explain the two definitions of money presented by the professor.
托福TPO2口语task6答案解析：
1. Listening keys
(1.1) Main idea: the two definitions of money
(1.1.1) Broad definition: anything that can be used to buy things with
(1.1.1.1) Example 1: a taxi driver earns five dollars for a ride, then use the five dollars to buy some vegetables
(1.1.1.2) Example 2: the taxi driver can take vegetables as payment in a barter system
Narrow definition: whatever must be accepted as payment (coins and bills)
(1.1.1.3) Example 3: in the US, the driver must accept coins or bills as payment
托福TPO2口语task6范文：
In this lecture, the professor talks about the two definitions of money. The first is broad definition which is anything that people can use to make purchases with. For example, a taxi driver earns five dollars for a taxi ride, he can then use the five dollars to buy some vegetable. While in a barter system, the driver can except vegetable for payment too. The second is narrower definition of money, which is the only legal tender to be accepted in a society. Take the same taxi driver for example, in the United States, only coins and bills are legal tender, so he must except paper bills or coins but vegetable as payment.