UPS can't have 2x number of drivers during the holidays because they only need 1x drivers for the other 11 months. Simple economics would show that 1/2 the work

UPS can't have 2x number of drivers during the holidays because they only need 1x drivers for the other 11 months. Simple economics would show that 1/2 the workforce isn't going to sit around for 11 months without pay. Customers don't care who the shipping provider is, and many companies / websites offer free shipping or a sane default, so really, who delivers what is often obscured from the end-user.