The term “triangular trade” is commonly used in international economics in response to concerns about bilateral deficits*. The general idea is that, even though a bilateral relationship may involve large imbalances, global flows of goods and services must balance in the long run.
In some respects, the pattern of trade between Australia, China and the United States fits the triangular trade story neatly. Australia exports lots of raw materials to China, which in turn exports a wide range of manufactures to the US, which exports high-tech goods and services to Australia. Much the same story is true, with other Asian countries such as Japan in place of China.
In the ideal version of the story, Australia would run a surplus with China, China with the US, and the US with Australia, and these (along with other bilateral balances) would wash out to leave all three countries in balance. The point of the “triangular trade” idea is that it’s a mistake to worry about bilateral balances, when trade benefits everyone.
But the Australia-China_US triangle fails to match this story in two crucial respects. First, instead of trade balance, Australia and the US have large and growing deficits, while China has a large and growing aggregate surplus. Second, the trade triangle is entangled with a triangular strategic relationship, in which Australia has to deal with the great power rivalry between the US and China.