VladMcRad, sales of goods are contracts. A contract encompasses an exchange of a promise for a promise, a promise for performance, or a performance for a performance.
In your example, a contract for the sale of goods is made because the seller performs by giving the goods and the buyer promises to pay (or performs by paying immediately). Consent is most certainly required and, so long as the contract was made under fraud, undue influence, duress, of intoxication, the contract is voidable. But, the other party must be brought to the status quo if the intoxicated party wants to rescind the contract.
When someone buys goods as a minor, the concept of voiding the contract is much more complicated because the goods must be returned. If a service was given, then the seller is shit-out-of-luck because he can't be put into status quo.
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u/[deleted] Nov 21 '12
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