This is a very simple program which returns the input matrix X from a Leontief
Input-Output model: `X=MX+D.`

Instructions are displayed when running the program to remind you of the usage.

- M = Technology Matrix (square matrix) - Must be saved in
`[A]` - D = Demand Matrix (column vector) - Must be saved in
`[D]` - X = Input Matrix (column vector)

The solution is X = (I-M)^{-1} * D