The data set that will be used for the GDP is from The World Bank, which already calculated the metric for all of the countries. In addition to the GDP, this study will also analyze GDP per capita, which helps in analyzing why GDP grows \citep{OECD2013}. The GDP per capita data per country will be taken from The World Bank’s database of GDP per capita. This metric is calculated by the formula below \citep*{Greenslaw2017}:
\[\text{GDP per capita}=\frac{\text{GDP}}{\text{population}}\]
The data will be cleaned through Microsoft Excel and will be further analyzed through JASP software.