The distribution of expenses among multiple parties, often leading to changes in individual contributions when participants change.

• A. Cost Sharing
• B. Allocation
• C. Apportionment
• D. Subsidy

Answer: (A)

When several parties benefit from a common expense, the total cost is shared among them. The idea is to divide the burden so each participant contributes a portion, and that portion can change if the group changes—more participants mean smaller shares per person if the same total cost is split evenly. This dynamic—costs being distributed across multiple people or entities and adjusting as who is sharing changes—captures the essence of cost sharing.

Allocation is a broader term about assigning resources or costs to different centers or uses, but it doesn’t specifically emphasize the joint sharing among multiple parties whose numbers may change. Apportionment involves distributing a cost according to a formula, which can be fixed or rule-based, but it isn’t inherently about the scenario where the number of participants alters individual contributions. Subsidy refers to financial aid or support from one party to another, not the sharing of expenses among the same set of participants.