Consider a patent race between Firm R and Firm S. Suppose that the patent is worth $10. The costs of R&D are $4, $10, and $15 million for moving 1,2, and 3 steps, respectively. Denote firms' research positions (using integers such as 1,2,3...) at the southwest corner of Trigger Zone |. Enter Firm R's research position (using an integer): l l 'v Enter Firm S's research position (using an integer): l l 'v