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                              Q:
                           
                           
                                                      | A) Line sloping upwards | B) Horizontal line | 
| C) Line sloping downwards | D) Vertical line | 
                              Answer:   B) Horizontal line
                              
                                                            
                              
Explanation:
                               
                           
                           Explanation:
The demand curve facing a perfectly competitive firm is a horizontal straight line equal to the equilibrium price of the entire market because a perfectly competitive firm can sell all units brought to market at the same price.
 
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