When it comes to fiscal policy, it can be a problem if government debt is no longer purchased as the government will turn to taxes for funding or reduce spending.
Government debt is affected by interest rates in that when rates are higher, the government borrows less.
If the government decides to stop buying government debt as is the case with Australia, it means that the government will either reduce its spending, or increase taxes.
Both of these things will lead to a lower economic growth and so are not desired. The government however, might be forced to reduce borrowing due to high interest rates that make borrowing more expensive.
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