A contract cannot be formed without consideration.

Consideration may be either:

1) a benefit conferred or agreed to be conferred upon the person making the offer [counteroffer] [or some other person], to which the person is not otherwise entitled; or

2) a detriment suffered or agreed to be suffered by the person [or some other person] to whom the offer [counteroffer] is made.

A written contract is presumptive evidence of consideration. [The burden of showing a lack of consideration sufficient to support a written contract lies with the party seeking to invalidate or avoid it.]

*****