This guide is a lost-treasure exercise to get your product noticed in a competitive market.Three years ago, a friend took me to San Francisco's Japantown. We stopped at a big grocery store, and I headed straight to the tea shelves. I wanted to buy genmaicha (green tea mixed with roasted rice). As I faced a sixteen-feet-long shelf full of green tea packages, my eyebrows started to raise. I counted eighteen different producers of genmaicha. Which one should I buy? I tried to narrow down my...