Under which condition does a country with a small GDP have a large per capita income?

A country with a small GDP can have a large per capita income if its population is very small relative to its economic output. For example, if a small nation has a high GDP due to significant income from sectors like finance, tourism, or Natural Resources, but only a few thousand residents, the per capita income can be quite high. Additionally, countries that rely heavily on foreign investment or have a high standard of living despite a small economy can also exhibit this phenomenon.