Box sets » Primary balance
The debt-stabilising primary deficit depends on the level of debt, nominal growth rates, the effective nominal interest rate, and any 'stock-flow adjustments'. This box discussed the historical evolution of the debt stabilising primary balance, and also explained why it may appear to be ‘easier’ to stabilise debt the higher it rises, and the fiscal risks that such an interpretation entails.
In our 2015 Fiscal sustainability report, we assumed that GDP grows in line with its historical trend. This in effect implied 47 years of uninterrupted trend economic growth in our central projections. This box considered the alternative paths for debt as a share of GDP under an symmetric and asymmetric cycle, highlighting the sensitivity of the net debt projections to economic cycles.
In our first June 2010 EFO, the debt-to-GDP ratio was forecast to fall by 2 per cent in 2015-16. This box explored how our debt-to-GDP forecast for 2015-16 evolved over time. It highlighted the contribution of the primary balance and the impact of other factors (including asset sales and the growth-interest differential) on the debt-to-GDP ratio forecast.