Automation or mechanisation has reduced the number of people required to do a given job and resulted in the loss of jobs which has been going on for decades. Farming is a good example, before steam animals pulled the plough and farms needed a lot of people to produce the grain and then came steam and the traction engine which reduced the number of farm workers further until today with the modern machinery that can plough, harrow and seed in one operation followed by the combine so not many people involved. This is how busineses increase the profit margins, they want less people with less skills to produce more by using technology to replace the need for a skill, ie push fit pipes and pre made roof trussses. So you can see how the gap is growing between the business owners and the workers, they get more profit and the worker has no grounds for pay progression as there is no need to be anymore skilled than they are and will at some point become to skilled as technology replaces them.