"Kaufen" is form of a daily, basic verb with the that means. "Einkaufen" puts the main focus a little bit additional on aquiring the goods. So, for those who'd say "Ich kaufe Obst und Gemüse ein", there's a tiny implication that you simply required People merchandise and now have them. http://bilddee.de/so-pflegen-und-warten-sie-ihren-sackkarren-richtig/