Test of a quadratic relationship between aggregate output and government debt in Hungary

The study which applies extended model of aggregate demand and aggregate supply (AD/AS) and uses a quarterly sample during the period from 2001 (Q1) till the last quarter of 2015, has shown that real GDP in Hungary exhibits a bell-shaped quadratic relationship with government debt as a percent of GDP (DY), direct relationship with the real effective exchange rate (ER), stock market price (SP) and the real crude oil price (OP), and an inverse relationship with the real government bond yield (IR) and the expected inflation rate (EI). The critical value of government debt as a percent of GDP is estimated to be 69.22%, which is higher than the EU criterion of 60.00% but less than the threshold of 90.00% proposed by Reinhart and Rogoff (2010).