Culture shock

I felt culture shock in the Artrium. While unusing food is not throw in Korea, it is throw to the trash in America. I experienced it. I will puchased potato, but I don't enough to money. So I can't puchase it. And I try it back, but chasher it throw in the trash. So I am embaressed and I can't understand this situation. Because potato possible to eat. I think that it is culture diffrence. If it occur in Korea, chasher will be not throw in the trash in Korea. But it is impotant that respect the culture. Thank you for reading.