Article — Konings, Theologia MoralisARTICLE I: ON PURCHASE AND SALE IN GENERALContents§ I. On the Nature of the Contract of Purchase and Sale§ II. On Those Who Can Buy and Sell§ III. On Merchandise or the Matter of Purchase and Sale§ IV. On the Just Price§ V. On the Obligations of the Seller§ VI. On the Obligations of the Buyer