Explain why you feel the idea isn't feasible and thank the employee for his initiative in bringing the issue to your attention. The responsibility for making a sound business decision didn't just rest with Marvin. Determining the positive impact her suggestion would have on the bottom line, then providing facts and figures to quantify this potential. Securing the support of her coworkers for implementing the idea before approaching her boss. Applying her idea in limited ways on the job to demonstrate how well it works.
Results always get the attention of management.
Overall, Wanda did right by her supervisor. She respected her boss' decision and didn't push the issue. And for a strong-willed woman, that was a Herculean feat. When you get down to it, winning in the workplace isn't about getting your way.