Local stores can now predict which new products will sell by watching immigrants

It turns out that new products enter local markets in two steps. First, people learn about them from friends and family, especially through migrant networks. Then, local stores watch what these "pioneer" buyers import and start stocking those products, expanding what's available to everyone.

Retailers have always tried to guess which new products will sell. This paper shows a clear, measurable way they actually learn: by watching what specific groups of consumers, often immigrants, buy first. This means the diversity of products on store shelves is often a direct result of social connections and early purchases within a community, rather than just big marketing campaigns.