Faced with this choice, Country A must decide which option is likely to get them what they want at the lowest cost. And one thing they need to weigh up is whether B can withstand and even retaliate to coercion. That’s what B’s armed forces are for. They exist to raise the potential cost of making threats, and thus to take that option off the table for A.
In other words, armed forces are necessary to incentivise foreign governments away from coercion and towards negotiation.
To illustrate the point, think about what Australia’s trade with China might look like if Australia abolished its Defence Force. In fact, we don’t need to imagine this because, in a way, New Zealand has conducted this very experiment. The NZDF is a pretty weak fighting force these days. So, is New Zealand now completely under China’s thumb, as the theory would suggest? Not really. China still trades with New Zealand at market rates rather than simply intimidating Wellington into giving away its exports for free.
That’s because, even against defenceless countries, making violent threats is costly and risky. First, China has its reputation to consider. What would its other trading partners think if Beijing went around strong-arming little countries such as New Zealand? China would suddenly become a less attractive partner, even an international pariah. Geography also plays a role. New Zealand is a long way away, which makes it hard for China to make credible threats – what damage could it even do to New Zealand? Finally, there is alliance politics to consider: if China threatens New Zealand, it will have to deal with the United States and Australia as well.
None of those factors eliminate the risk that China will threaten New Zealand, but they do severely reduce it. New Zealand has made the reasonable decision that the risk is small enough to take.
Australia, just as reasonably, has made a different decision. Australia runs higher risks, firstly because we don’t have a big ally living right next to us, as New Zealand does. And Australia has a bigger economy with more valuable exports, so is more likely to be subject to Chinese threats. In fact, Beijing has imposed trade measures against Australia over the last two years to protest Australian policies and force us to change them. It is telling that China has used economics to coerce Australia rather than threats of force. This might be counted as evidence that the ADF is doing its job.
A final point: although military forces are a critical pre-condition for trade, this is not the same thing as saying that Australia needs the ADF to protect its trade routes. The debate over whether one nation can bend another to its will through blockades is another lively one, which Defence Minister Richard Marles entered on the ABC’s Insiders program a few weeks ago.