36. When are promises based on past consideration enforceable? a. When the sale of goods is involved b. Always c. When an illusory promise is made d. To prevent unjust enrichment e. Never 37. In a(n debt, the parties either dispute the fact that any that money is owed but dispute the amount money is owed or agree a. Unliquidated b. Acknowledged c. Actual d Liquidated e. Certairn to contract is one who has the mental A person who has legal ability to understand his/her rights and obligations under a contract and, therefore will presumably be able to understand how to comply with the terms of the agreement. 38. a. Capacity b. Understanding c. Consideration d. History e. Ratification