Types of Defective Contracts:

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THERE ARE FOUR KINDS OF DEFECTIVE CONTRACTS.
THEY ARE IN THE ORDER OF THEIR DEFECTIVENESS
OR EFFICACIOUSNESS:
INTRODUCTION
(1) Rescissible contracts. — They are the least infirm or defective.
They are valid because all the essential requisites of a contract exist
but by reason of injury or damage to one of the parties or to third
persons, such as creditors, the contract may be rescinded. Thus, the
defect is external. Until such contracts are rescinded in an
appropriate proceeding, they remain valid and binding upon the
parties thereto (Chap. 6.);
(2) Voidable contracts. — They are also valid until annulled unless
there has been a ratification. In a voidable contract, the defect is
caused by vice of consent (Chap. 7.);
(3) Unenforceable contracts. — They cannot be sued upon or
enforced unless they are ratified. As regards the degree of
defectiveness, voidable contracts are further away from absolute
nullity than unenforceable contracts. In other words, an
unenforceable contract occupies an intermediate ground between a
voidable and a void contract (Chap. 8.); and
(4) Void or inexistent contracts. — They are absolutely null and
void. They have no legal effect at all and cannot be ratified. (Chap.
9.) According to the Code Commission which prepared the draft of
the present Civil Code, a great deal of confusion has been created by
the faulty terminology used in the old Civil Code as regards
defective contracts. There was no sufficient clarity as to contratos
nulos and contratos anulables — void and voidable contracts. I
order to put an end to the uncertainty and other ambiguities in the old
Code, the present Code in a clear-cut and unequivocal way classified
and defined the various kinds of defective contracts, and stated their
consequence