CREATE TABLE table_43018 ("Country" TEXT, "Area  ( km\\u00b2 ) " TEXT, "Population  ( 2011 est. ) " TEXT, "Population density  ( per km\\u00b2 ) " TEXT, "GDP  ( PPP )  $M USD" TEXT)

How much is the population density with a GDP at $188,112?
SELECT "Population density (per km\u00b2)" FROM table_43018 WHERE "GDP (PPP) $M USD" = '$188,112'
SELECT "Population density (per km\u00b2)" FROM "table_43018" WHERE "GDP (PPP) $M USD" = '$188,112'