I'll give you an obvious example. A service business that helps established businesses shift more of their work to remote. The demand is enormous right now. Se

I'll give you an obvious example. A service business that helps established businesses shift more of their work to remote. The demand is enormous right now. Service businesses are labor intensive, they don't scale easily, so during a boom demand time there is never enough specialized labor to go around. That will taper off after a while. So as you build the business, begin offering other services to your new customers (services that are sustainable after the remote boom fades). Look for enduring businesses that are unlikely to fail short-term during the economic disaster; businesses that have some forced regulatory-based demand are ideal (certain small to mid-size insurance agencies; some things in real-estate; law firms depending on the segment; and so on).