Classification of contracts
By type of formation
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Express (is stated in words or oral, this contract is conscious)
| Implied:
· Implied-in-fact (is manifested by conduct rather than words)
· Implied-in-law (is crested by operation of law in order to avoid unjust enrichment of one party)
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By type of performance
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Bilateral (is based on the exchange of promises)
| Unilateral (involves a promise by one party and an act by the other party)
| Executed (is one that is fully performed by both parties)
| Executory (something remains to be done)
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By enforceability
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Valid (it meets all legal requirements and can be enforced by parties)
| Unenforceable (does not meet all legal requirements)
| Void (is made under threat or physical force)
| Voidable (is made by minors, or under mental duress)
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