18.15 Mathematical Methods and Models in Economics

Condition: a) give an example of at least one balance table of two industries: for which the matrix of direct costs has the form: \ (a = \ left (\ begin {array} {ll} \ frac {1} {6} & \ frac {1} \\\ \\\ \\\ \ frac {1} {3} & \ frac {1} {2} \ end {Array} \ Right) \). b) Find the matrix \ (c = a^{t} \ cdot a-e \).