What are some of the factors that can cause a country's gross domestic product per person to change

Increased technological advancement in a country improved efficiency in government and business operations hence improving the Gross Domestic Product of the country. This consequently leads to an increase in GDP per capita.

Other factors that improve GDP per capita is;

Improved exploitation of natural resources Performing human resources

Factors that can lead to a reduction in GDP per capita are;

Wars Disease pandemics