Passengers are supposed to acknowledge the applicable restrictions in their destination airport with regards to the limit of products to be imported, allowances to be paid, and also sanitary or safety issues.
Entering into Argentinean territory: the maximum purchase per passenger in duty free stores is U$D 500 (five hundred US dollars) or its equivalent in other currency.
Passengers are obliged to pay Customs taxes on what exceeds this amount (50% aliquot on the surplus).
For further information regarding limits and restrictions, please visit AFIP website: http://www.afip.gob.ar/viajeros and/or http://www.afip.gob.ar/informacionVisual/documentos/infografiaregimenEquipaje.pdf
For information of other countries check https://www.shopdutyfree.com/en/custom-allowances