The EU Stability and Growth Pact sets a maximum budget deficit of 3% of GDP, which is believed to be linked to historical inflation rates. A deficit equal to the inflation rate is thought to prevent growing debt over time. The choice of 3% is seen as a rounded figure that aligns with typical inflation rates, allowing for increased tax revenues as wages rise with inflation. This mechanism helps maintain a sustainable debt level, especially when considering GDP growth, which can support a higher sustainable deficit of around 5%. The 3% threshold serves as a safeguard against scenarios where GDP growth is stagnant. Ultimately, the number is viewed as somewhat arbitrary, having been established during the formation of the EU and now reinforced as a standard.