Explanation:

- Exchange Money: This refers to exchanging one form of money for another. It is generally not used in legal contracts to represent the 'consideration' in a sale.

- Barter Money: This concept involves exchanging goods without using money. It does not fit the typical definition of consideration in a sale contract.

- Price: This is the monetary value assigned to the item being sold. In a contract of sale, the consideration is typically the price paid by the buyer to the seller.

- Reward: This generally refers to something given in recognition of an achievement and not typically used as a term for consideration in sales contracts.