Answer:
legal purpose.
Step-by-step explanation:
I might be wrong so here are the definitions for all the terms:
legal capacity: a person's authority under law to engage in a particular undertaking or maintain a particular status.
exchange of value: an exchange value, which is the proportion at which a commodity can be exchanged for other commodities; a price (it could be an actual selling price or an imputed ideal price )
Legal purpose: Legal purpose is an insurance principle according to which insurance contracts that insure something illegal or involves illegal conditions are not valid. For example, a liability insurance policy for a bank robbery company would not be valid.
offer and acceptance: the meaning of offer and acceptance is the basis of a contract. To form a contract, there must be an offer made by one party which is, in turn, accepted by another party, and then, in most cases goods and/or services must be exchanged between the two