Quid pro quo (From the Latin meaning "something for something") indicates a more-or-less equal exchange or substitution of goods or services. English speakers often use the term to mean "a favor for a favor" and the phrases with almost identical meaning include: "what for what," "give and take," "tit for tat", "this for that", and "you scratch my back, and I'll scratch yours". Something like "Reap and Sow" also applies to this phrase.When I use the phrase Quid Pro Quo, I'm not referring to bribery. The idea of scratching one's back for a favor could be misconstrued as a bribe.
Why am I mentioning quid pro quo? You may have the ability to offer a unique service, but perhaps you don't know how to sell that service. Perhaps you'd like to be a consultant, but you don't know how to begin. One way to get customers immediately is to offer your service in exchange for a service. This way, there is no money exchanged but you may establish customers which will lead to positive testimonials if you do a good job. You'll also develop a reputation and this could help you gain additional customers as you network and meet new potential customers who may be interested in your services. You'll also gain experience and you'll learn where you may need to make improvements.
There are many things you may gain by exploring quid pro quo opportunities, especially when you're exploring a new business model. Perhaps you'll find a potential customer who's willing to exchange services with you.