A more thorough explanation:

Definition: A cambist is a broker who trades promissory notes or bills of exchange. The term comes from the Latin word "cambiare" which means "to exchange". Cambist is also known as cambiator.

Example: John works as a cambist at a bank. His job is to buy and sell foreign currency and bills of exchange for the bank's clients.

Explanation: The example illustrates how a cambist works as a broker who deals with promissory notes or bills of exchange. In this case, John is responsible for buying and selling foreign currency and bills of exchange for the bank's clients. As a cambist, he helps clients exchange their money for different currencies or invest in bills of exchange.