Coal mining is a dangerous and dirty job.Suppose someone developed new machinery that made coal mining safer and cleaner;at the same time,it made coal miners more productive.We would expect that the wages of coal miners would
A) rise.
B) fall.
C) stay exactly the same.
D) rise,fall,or stay the same.

Question

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The Answer of Coal mining is a dangerous and dirty job.Suppose someone developed new machinery that made coal mining safer and cleaner;at the same time,it made coal miners more productive.We would expect that the wages of coal miners would
A) rise.
B) fall.
C) stay exactly the same.
D) rise,fall,or stay the same.

Coal Mining Is a Dangerous and Dirty Job