If we had retained the Neil Patrick Harris advertising campaign for September to December, our unit sales would have potentially been different. Perhaps they would have (i) continued going up, perhaps they would have (ii) declined, or perhaps they would have (iii) remained relatively flat from September to December. For each of these three possible scenarios, come up with a possible explanation for why sales would have evolved as described; e.g., what might have caused sales to decline from September to December? Which of these three scenarios do you think would have been most likely? Explain why you think so