To solve the policy of the firm, simply save all files in some directory, and type "main" on matlab command windos

This version assumes a perfermance covenant as in Section 4.2.2 of the paper. Therefore, there is no precautionary exit.

Current parameters compute a solution with a coarse grid and small number of iterations

To get a more accurate solution, increase parameter "iternum" to e.g. 500000, and 
"iterfine" to 5


