Final answer:
Agreed-to commission is typically described in the employment contract or sales agreement.
Step-by-step explanation:
In a business environment, if a separate commission agreement document is not used, the agreed-to commission is typically described in the employment contract or sales agreement. These agreements outline the terms and conditions of the employment or sales relationship, including the commission structure. For example, in an employment contract, a section may be dedicated to discussing the commission structure, stating the percentage or formula by which commissions are calculated.