If you have a hypothetical country with a huge swath of empty land, and a single city with the population density of Hong Kong, the population density of that c

If you have a hypothetical country with a huge swath of empty land, and a single city with the population density of Hong Kong, the population density of that country will appear to be low, but in fact all the people living in the country live in a highly dense city. Perhaps a better measure than population/land area would be the average of the population density in the square kilometer surrounding each inhabitant (or something like that).