Both assumptions are correct, and both are wrong - according to which business model followed.
In the “Just in time” model, there will always be a shortage of drivers for key shifts that are often “difficult to fill”, and yet these “surges in demand” are not worth taking on a single driver full-time for in themselves.
Perhaps a 4 hour per day thing where you “for those four hours” need an extra 25 drivers…? Outside those times, you don’t even need a single full timer.
The only line of work in this country that has a steady 24/7 demand - is “having an accident” with hospital admissions day and night being around the same, with surges during a particularily bad motorway pile-up, or building fire for instance.
And yet various Health Ministers have struggled to put the NHS on the same 24/7 footing like the Transport industry runs on already!!
As it stands, if you go into hospital between 18:00 friday and 06:00 monday morning - you’re far more likely to actually die, no matter how minor the injury.
"There simply aint enough specialist injury/trauma medical staff on shift at these times… Bearing in mind that the Friday “killer” Rush hour falls in this quite wide margin, as well…
“Getting hurt” is a 9/5 affair only for things like minor ops, and non-life saving treatments. Even then there is a HUGE demand during “Office Hours” evident with the usual queues in waiting rooms that all-too-often seem to comprise of “People that have got all day” such as benefit claimants, the retired, and the accident prone.
When they tried putting the NHS on a “Just in time” agency model - they ended up forking out rates like £50ph, and living next door to such a worker - it all seems to have died off by this point, 2019 - leaving those that have left “full time” now struggling to do anything other than “Take a career break”.
I wonder what would happen to the entry levels of the transport industry IF such high hourly rates ever got applied to Transport agency workers?
“Supply creates it’s own demand”
(Say’s Law)