food from across the world

Normally, i try to eat food from my country so me and my family always shop from African's store. This friday i wanted to eat some yam, so me and my mother went to the African store near us to get some yam and later we cooked it. The geographical location we talked about in class is what permits me to eat food from my country anytime i want to and i am very grateful for that.
Pollan wants people to buy locally, but i don't know if me and my family purchasing food that comes from another continent is buying locally. I may not be helping locally, but i am glad to buy food that comes from my country. In that way i feel like i am helping the farmers of my country and the owner of the store in his business. I also act ethically in eating food i know. The foods me and my family buy from the African store, are food we know and it is the correct behaviour to not deny foods from your country.
When i wanted that yam, my mother could have refused to buy it because foods coming from another continent can be expensive, but as Keynes says hoarding is bad so in my family we always spend the necessary to feed ourselves. That is why we don't buy more than the necessary because trowing food is not acceptable. As Pollan says the nature of human body can consume only so much food no matter how plentiful the supply(49), so we only buy the necessary and we go shopping a few times in a week when we are in need. Like when i decided to eat that yam, we had to go and get the one we saw that we could finish.