If the size of the debt is rising faster than the increase in GDP, the interest payments on the debt will take up a greater proportion of GDP. This may pose debt sustainability problems in the future, as the size of debt exceeds the level of income growth. This can also impact on our credit rating as a nation. As of 2020, Australia has a AAA credit rating from all three world credit rating agencies. If the credit rating falls, this may decrease investor confidence and cause a contraction in AD, lowering economic growth. Recently, Australia’s net foreign debt as a percentage of GDP is 56%.