Anything involving security. Rich people will be desperate for protection, and this is an option they have and that you don't. so alarms, house monitoring, bodyguards, bunkers, access control, vetted staff, school run drivers. Also food supply, so if you can get food, fuel and generators into a city, you can profit from anyone stuck there Rural Rentals. Eventually everyone will want out of a city, sometimes at the last minute and they will all need a place to go to that has food/water/power/bunker There is a steel bunker manufacturer whose business is going ape this year, he's gone from half assed bunker designs to co-opting every welding business for miles.