You make reference to underlying assumptions about the economics of drone delivery, but I don't think you've shown anything. What is the average cost per UPS d

You make reference to underlying assumptions about the economics of drone delivery, but I don't think you've shown anything. What is the average cost per UPS delivery, and what would the cost be with a drone? Assume a drone has an avg 1 year lifespan, can make 20 deliveries a day, costs $9k, and $1k in annual power and maintenance. Thats $1.40 per delivery. If a UPS driver + truck cost $100k / year and can do 200 deliveries a day, that's also $1.40 per delivery. I have no idea about the accuracy of my numbers above, but neither seems out of the realm of possibility. I can definitely see drones being economical.