RiotGear promises to donate a share of the proceeds from the sale of the “Occupy Earth/Global Movement”

line to The Cause, a charitable organization dedicated to supporting those who seek social and economic change through protest. In reliance on the expected donation, The Cause contracts for medical and other supplies.

When Standard increases the distribution cost, RiotGear tells The Cause that there will be no donation.

Can The Cause enforce RiotGear’s original promise despite the lack of consideration? Yes. Under the doctrine of ______________ ______________, a party who makes a promise can be estopped from revoking it. For the doctrine to be applied, (1) there must be a ______________, (2) the promisee must reasonably rely on it, (3) the reliance must be substantial and definite, and (4) justice must be better served by the enforcement of the ______________. It is reasonable to expect that a charitable organization will incur obligations in reliance on a ______________ of a donation.

Failing to enforce it would be unjust.