(See Solution) Starting with the data for problem 6 (see appendix for ch 4 below) and the data on the price related commodity for the years 1986 to 2005
Question: Starting with the data for problem 6 (see appendix for ch 4 below) and the data on the price related commodity for the years 1986 to 2005 given below, we estimated the regression for the quantity demanded of a commodity (which we now relabel Q X ), on the price of the commodity (which we now label P X ), consumer income (which we now label Y), and the price of the related commodity (P Z ), and we obtained the following results. (If you can, run this regression yourself; you should get results identical or very similar to those given below.)
| YEAR | 1986 | 1987 | 1988 | 1989 | 1990 |
| P Z | 14 | 15 | 15 | 16 | 17 |
| YEAR | 1991 | 1992 | 1993 | 1994 | 1995 |
| P Z ($) | 18 | 17 | 18 | 19 | 20 |
| YEAR | 1996 | 1997 | 1998 | 1999 | 2000 |
| P Z ($) | 20 | 19 | 21 | 21 | 22 |
| YEAR | 2001 | 2002 | 2003 | 2004 | 2005 |
| P Z ($) | 23 | 23 | 24 | 25 | 25 |
- Explain why you think we have chosen to include the price of commodity Z in the above regression. (b) Evaluate the above regression results. (c) What type of commodity is Z? Can you be sure?
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