Suppose that roofers are not unionized. if roofers unionize, then the supply of labor in other sectors of the economy will

The answer is increase.

Explanation:

What unions do is basically restrict the number of workers in an industry. They act as a labor cartel in order to increase the unionized workers´ wages. In this specific case, if roofers unionize, eventually there will be less roofers working in the economy. That means if there are less roofers, the ones that remain doing the job will get paid better. On the other hand it also means that there will be a larger supply of workers for other jobs.  

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answer; ///(d); determining who competes most closely   with whom evaluating whether industry driving forces and competitive pressure favor some strategic groups and hurt others, and ascertaining whether the profit potential of different strategic groups varies due to the strengths and weaknesses in each groups respective market positions;