EX: Simulate the growth in the sales force of a company selling computers.

Initial sales force is $50$ people, and it is subject to a $20\%$ annual exit rate.

The company recruits new people based on the budgeted size of the sales force. Budget is $50\%$ of the company's annual sales from the sale of computers, and it takes time to hire.

Computer sales depend on the number of sales people and their individual effectiveness.

Effectiveness of each salesperson will fall below $2$ computers$/$day once the sales force climbs above $400$ people

Computer price and salary of sales person are also available and constant