Stating with certainty a fixed amount of money to be paid at the time an instrument is payable ensures that the value of the item can be determined with clarity.

Certainty

Refers to the assurance or confidence in the truth or occurrence of something without doubt.

Fixed Amount

A specific sum of money that does not change over time or with use, often referring to payments or charges.

Payable

Refers to an amount of money that is owed and should be paid, often within a specific period of time.