Final answer:
Marketers would expect to see the highest frequency of adoption for a given product in the middle of the diffusion of innovation curve.
Step-by-step explanation:
According to the diffusion of innovation curve, marketers would expect to see the highest frequency of adoption for a given product in the middle of the curve.
This is when the product has already been adopted by innovators and early adopters, and it starts to gain acceptance among the majority of consumers.
At this stage, the product has overcome initial skepticism and more people are willing to try it based on positive reviews and experiences from early adopters.