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Today commercial papers can be grouped into two broad categories.
The first is composed of unconditional orders to pay money. In this category are the draft and the cheque. A cheque is a special kind of draft.
The second category is composed of unconditional promises to pay money. In this category are the promissory note and the certificate of deposit (COD).
The word unconditional means that the legal effectiveness of the order or promise is not dependent upon any other event. IOU (I owe you) is not a commercial paper.
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In the second category are the promissory note and _________________.
the certificate of quality
the certificate of quantity
the certificate of vaccination
the certificate of deposit