German population density map: https://commons.wikimedia.org/wiki/File:Population_density_in_Germany.png
U.S. population density map: https://es.m.wikipedia.org/wiki/Archivo:US_population_map.png
1 square mile is about 2.6 square km, so 2500 people in one square km is about 6500 people per square mile.
Groceries.
The debt is for groceries.
Super wealthy people portray it like you just did, but what you said isn't accurate.
People are putting basic necessities on credit cards now.