the following questions: a. Please note the X-axis for the TIPs curve is scaled with positive (or negative) numbers. Why do you think that is the case ? b. What does the Spread Chart represent ? What is the slope of this curve ? (Please be detailed in answers to these questions.) c. Bonus Question (not required for HW completion). What do you think the historical shape of the above Spread Curve has been and why it may be different from today