A more thorough explanation:

Contingent demand is a type of demand that cannot be determined or fixed because it depends on the occurrence of a particular event or contingency. It is a demand that is conditional and uncertain.

• A person may demand payment for services rendered only if the client is satisfied with the work done.
• A company may demand payment for goods sold only if the goods are delivered on time and in good condition.
• A tenant may demand repairs to the rental property only if there is a leak or damage caused by the landlord's negligence.

These examples illustrate how contingent demand is dependent on certain conditions being met. The demand cannot be fixed until the contingency is resolved. In other words, the demand is not certain until the event or condition occurs.