Question

why some countries are the richest countries while they are small in size​

Answer 1

Explanation:

Differences in the economic growth rate of nations often come down to differences in inputs (factors of production) and differences in TFP—the productivity of labor and capital resources. Higher productivity promotes faster economic growth, and faster growth allows a nation to escape poverty.

Answer 2

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It is easier for smaller countries to rise and fall compared to big countries which usually take time to rise or fall. Smaller countries can depend on single aspects for their growth: Oil/Tourism/Commerce alone can help small countries achieve higher levels of GDP.