How does the productivity in one industry lead to an increase in the unemployment rate within that industry if wages are unable to adjust downward?

What do YOU think ?
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My confusion begins with understanding the concept of wages adjusting downward

Well what does that imply ?

I don't understand why the wage would ever adjust downward. And if it does, what does that mean?

I believe it should be productivity INCREASE. Then what happens, lets say new machinery to increase production. Look at the auto industry, robots mostly build cars now, not people.

I don't understand why the wage would ever adjust downward. And if it does, what does that mean?

Workers take a cut in pay when profits are down, to keep their job and keep the business going. Again the auto industry is an example during the economic downturn of '07.