as7 - ECON 331 Written Assignment 7 due in class Nov. 4 1....

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ECON 331 Written Assignment 7 due in class Nov. 4 1. Let A 4 8 4 12 8 4 240 Use the properties of determinants to show that A is a singular matrix. (i.e. compute the determinant of A using only Theorems 9.1 to 9.8 in the text) 2. The demand and supply functions for three related markets are as follows. q 1 d 41 9 p 1 p 2 p 3 q 2 d 40 p 1 2 p 2 2 p 3 q 3 d 11 p 1 2 p 2 2 p 3 q 1 s 2 p 1 2 q 2 s 4 p 2 3 q 3 s 5 p 3 13 Write the equilibrium condition for these markets as a matrix equation involving the
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