Gold or Bitcoin

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 an