It really comes down to supply and demand. In areas where there is a shortage of supply of workers that have a particular skill that businesses value wages do rise. However, if there is plenty of supply for certain kinds of jobs then the market will not pay them as much.

I do think that automation/increased productivity plays a part if you automate things out where more people are now capable of doing a particular job it will deflate the wage of that role since there is a greater supply that can now perform that role.