If there is a shortage of workers to fill a position...rest in details?

I have been told from time to time that ,that would drive the wages up for that position, why has that not happened in the trucking industry due to the driver shortage?
They in turn try to entice foreign workers to fill these driver jobs.
For those that argue and say wages have increased for these jobs, gee if that is true then why the shortage or drivers?
I know from being in this industry for close to thirty years the pay has barely gone up at all.
What is it going to take to get drivers?