A contract of sale on approval is a contract which is constituted to be subject to the suspenseful condition of the approval of the object of the sale by the buyer.

In a contract of sale on approval the seller is bound to permit the buyer to examine the object sold.

If the object has been examined without being delivered and the buyer has not declared his acceptance within the agreed deadline, the buyer is deemed to have refused acceptance. The same rule shall be applied, if in the absence of an agreed deadline the buyer has not declared his acceptance within a reasonable deadline fixed by the seller.

If an object has been delivered to be examined and the buyer does not return the object or declare his refusal within the agreed deadline, or, in the absence of an agreed deadline, within a reasonable deadline fixed by the seller, the buyer is deemed to have accepted.
If the buyer has paid the whole price or a portion of it, or does any action which is not necessary for examining the object, he is deemed to have accepted it.

In a sale according to sample the seller is deemed to warrant that the object delivered will have the same quality as the sample.

A clause in a contract of sale by installments that the whole of the: price may be claimed by seller as soon as the buyer is in default shall not be enforced, unless the buyer is in default for installments representing at least one-fifth of the total price.

A clause in a contract of sale by installments, if it is agreed that, upon the rescission of the contract, the seller may retain the installments received, the amount retained shall not exceed an amount representing the rental of the object sold plus damages in case the object sold has sustained any injury.

A sale by auction is constituted when the auctioneer announces its completion by knocking down the hammer or in any other customary manner.

The auctioneer shall not bid nor employ any person to bid at any auction conducted by him.

Unless the person who has ordered the sale has expressed a contrary intent, the auctioneer has the right to adjudge the lot to the highest bidder.

The auctioneer may not announce the completion of the sale, and withdraw a lot from the auction if he thinks that the highest bid is insufficient.

A bid made by a bidder ceases to be binding, when a higher bid is made or when the lot is withdrawn from the auction.

The buyer at a sale by auction shall pay the price in cash when the sale by auction constituted or at the time fixed by the notice advertising the sale.

If the buyer at a sale by auction fails to pay the price in time, the auctioneer may rescind the contract and resell the thing by auction.
If the price of the second auction does not cover the original price and costs of the resell by auction, the original buyer is liable for the difference.