It is possible to completely omit "einkaufen" and it might still be a superbly correct sentence (though it would leave us guessing just what the speaker is planning to do for the farmer's industry): "Ich gehe auf den Bauermarkt." To perspective this online video make sure you empower JavaScript, and https://magazin-welt.de/die-vorteile-eines-massivholzbetts-haltbarkeit-stil-und-nachhaltigkeit/