1. As you may aleady know, a heavily used rail line runs through downtown Tucson.
(a) Which railway company owns that rail line?
(b) Why is that line so heavily used?
(c) What technological and economic change(s) have increased the importance of that railline, in recent decades?
(d) How does that increase in rail traffic help Tucson’s economy?
2. Amazon is a classic entrepreneurial success story, which continues to report rapid growth and largeprofits. This question concerns Amazon’s original line of business, online sales of merchandise (includingvideo); you can disregard later ventures such as cloud storage, Alexa, Whole Foods, etc.
(a) Does this success imply that Amazon benefits from a barrier to entry into its market?You should next answer either (b) or (bN), not both.
(b) If Amazon does benefit from a barrier to entry, then what is that barrier(s)?(bN) If not, then how can you explain Amazon’s continued high profits?

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