Can copywriters, advertisers, and marketers have a system to certify our effectiveness?

When you’re marketing nutraceutical products, you can make guarantees about potency and purity more readily than you can talk about the health claims.

It takes various kinds of approval and certification to state that your products are safe (such as GRAS status) or to make a specific health claim.

What about marketing? If there were a way to certify that a given copywriter could produce a boost in profit, wouldn’t you want to work with that person?

Since there’s no third party that I’m aware of, I’m experimenting with the possibility of offering a money-back guarantee, or a fee schedule based on performance. Salespeople essentially do this already, but if you simply put copywriters on commission you’re going to have disputes over who really made the sale–the salesperson or the writer.

I’m testing out a few schemes with existing clients, and I’ll let you know if I figure out a system that works for everyone. Do you have any ideas?