For example, if you're selling residential real estate, your success could also mean success for a mortgage banker. Or a moving company. Or an interior designer. If you're selling computer hardware, your success can help people who sell computer software. In the corporate world, there's a hot trend called strategic alliances.
Computer companies form an alliance to develop and promote a technical standard.
These strategic alliances are nothing more than an answer to the above question. It's a no-brainer. Ask yourself this question and be creative about your answer. I think you'll find a whole world of possibilities opening up.