Answer:
C. Because union wages exceed nonunion wages, employees may be encouraged to work harder.
D. Unions may provide information to companies about how to improve operations and eliminate problems in the work environment.
Explanation:
Workers' unions have been instrumental in ensuring that workers work in the environment that is safe and conducive. Not only that, the unions also ensure that the workers are remunerated fairly for their labor and services. Thus, the wages of the unioned workers are higher because unions bargain for the increase in the worker's wages. 
Furthermore, the worker's union work hand in hand to exchange information about the conditions of the workers and how the companies can eliminate the potential problems that result in worker dissatisfaction. In addition, the unions protect workers from exploitation.  
 
        
             
        
        
        
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The value of the investment could be unpredictable when the investment is volatile. To add up, the fluctuation patterns of the value could be a lot different than it should be. It can be observed in a graph that the curve just suddenly rises and falls covering only a smaller amount of time.
        
                    
             
        
        
        
Answer:
Option C - each seller supplies a negligible fraction of total supply.
Explanation:
Price is constant to the individual firm selling in a purely competitive market because each seller supplies a negligible fraction of total supply.
 
        
             
        
        
        
When workers stop working until management meets certain conditions, the event is called a Strike.
Strikes are usually performed by the workers to put their unfulfilled demands in front of the management and workers intent to continue the strike until their demands are fulfilled or other remedies are given which satisfy the workers. 
Hence the correct answer is <u>Strike</u>