Latin
Lines 1.654-1.658
Roman Law and Society, The Institutes of Justinian 1.654-658
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XVII. Buying &Selling.
The contract of sale is formed as soon as the price is agreed upon, although it has not yet been paid, nor even an earnest given; for what is given as an earnest only serves as proof that the contract has been made. This must be understood of sales made without writing; for with regard to these we have made no alteration in the law. But, where there is a written contract, we have enacted that a sale is not to be considered completed unless an instrument of sale has been drawn up, being either written by the contracting parties, or at least signed by them, if written by others; or if drawn up by a tabellio, it must be formally complete and finished throughout; for as long as anything is wanting, there is room to retreat, and either the buyer or seller may retreat, without suffering loss; that is, if no earnest has been given. If earnest has been given, then, whether the contract was written or unwritten, the purchaser, if he refuses to fulfill it, loses what he has given as earnest, and the seller, if he refuses, has to restore double; although no agreement on the subject of the earnest was expressly made.
1. It is necessary that a price should be agreed upon, for there can be no sale without a price. And the price must be fixed and certain. If the parties agree that the thing shall be sold at the sum at which Titius shall value it, it was a question much debated among the ancients, whether in such a case there is a sale or not. We have decided, that when a sale is made for a price to be fixed by a third person, the contract shall be binding under this condition---that if this third person does fix a price, the price to be paid shall be determined by that which he fixes, and that according to his decision the thing shall be delivered and the sale perfected. But if he will not or cannot fix a price, the sale is then void, as being made without any price being fixed on. This decision, which we have adopted with respect to sales, may reasonably be made to apply to contracts of letting to hire.