Now compare GDP/km^2: USA: 1,773,047 USD/km^2 HONG KONG: 63,633,823 USD/km^2. Huh. Hong kong has almost 36x the GDP density... With comparable GDP per capita.

Now compare GDP/km^2: USA: 1,773,047 USD/km^2 HONG KONG: 63,633,823 USD/km^2. Huh. Hong kong has almost 36x the GDP density... With comparable GDP per capita. Is that significant?