That doesn't seem like a difficult problem to solve. Delivery isn't free, even if the customer isn't the one paying for it. If standard delivery becomes more e

That doesn't seem like a difficult problem to solve. Delivery isn't free, even if the customer isn't the one paying for it. If standard delivery becomes more expensive due to the weather-linked bursty nature of the load requiring additional provisioning, you just need to charge more for standard delivery. Which I'd expect a company like amazon to implement as a fair-weather discount, given the propensity of humans to be loss averse.