Consideration is…
a bargained-for exchange between parties for legal value.
The modern view permits common law contract modification without consideration if:
(1) the modification is due to circumstances that were unanticipated by the parties when the contract was made; and
(2) it is fair and equitable.
Under the UCC, consideration isn’t necessary to modify a contract, all the parties need are…
good faith promises of new and different terms.
A promise is enforceable without consideration because it is necessary to prevent injustice if:
(1) the promisor should reasonably expect to induce action or forbearance, and;
(2) such action or forbearance is in fact induced.