1. How dense the population is
2. How dense the population is
2b. Poverty
If people can't afford to stay home from work to quarantine, they're spreading it to every customer, especially in stores that can't afford PPE or plexiglass barriers
My girlfriend's entire office was infected by one of her newest hires. She was just out of college and struggling with cash, so she didn't call in sick and even took extra shifts
