A trend spotter refers to someone who specializes in identifying new market trends and make the changes possible.
He is a keen observer, alert and notices on new fashions, changing habits, activities in the market. He can be forecaster, business leader, politician, stock analysist, futurist who identify trends and talk about the future to transmit a story into value for others.
In short, the role of a trend spotter is to tell persuasive stories about the present and the future to influence others.