I think with food the closer to home you can buy it the better. It's going to be fresher for a start, you know it's history, we have high standards of health and safety and it's great to support local farmers and manufacturers.
I'm from the UK, so I'll base my answer on buying British produce. I definitely think buying British is better not only for the economy, but I also think a lot of British food tastes better, such as strawberries. I won't let that determine my decision. I'll generally go by what's the best price, and what is the best quality. If that is British, then all the better.
I do support Australian products as it is important to our welfare. Local produce is always the Freshest and the Austtalian Standards in Manufactoring is one of the highest in the world therefore products are valuable.
I agree to an extent. However, being from the UK, I do buy British food products, particularly from Aldi who usually have a pretty good range of such products when they have "special" sales. Having mentioned Aldi I buy most of my groceries there, and they do use Australian producers for their meat and fresh produce.
Yes, so we keep what's left of our self-sufficiency. Fresh, not transported, is best. Australian produce is the cleanest and has fewer chemicals. We should put our farmers and country before our bank balance.