Iruma
Iruma's tea economy sits beside a 4-million-visitor outlet corridor; the city is building connectors so Route 16 traffic does not bypass its higher-margin tea landscape.
Iruma's harder problem is not attracting visitors. It is siphoning even a fraction of them away from the highway boxes. The city sits on a retail corridor that already draws millions of shoppers, yet its older tea economy still has to fight for every stopover.
Iruma sits 126 metres above sea level in Saitama and had a verified population of 142,841 on May 1, 2025. It is still the main production area of Sayama tea, and the city says roughly 100 tea shops remain across the municipality. But the city also admits something more revealing: around 4 million people visit Mitsui Outlet Park Iruma and other large commercial facilities each year, while the nearby tea-growing district still lacks a destination strong enough to pull those visitors deeper into place.
That is the real business problem. Iruma's own tourism material says about 400 hectares of tea fields spread just beyond the better-known shopping corridor. The city also warns that Costco and the outlet can jam Route 16 and surrounding roads during long holidays and year-end periods. Network effects are doing exactly what they do in biology and commerce alike: once the retail node gets big enough, it concentrates traffic, attention, and spending around itself. The tea side of the city faces the opposite trend. Iruma says household consumption of loose green tea in 2022 fell to roughly 60 percent of the 2006 level even as bottled green tea consumption rose by about 20 percent. So the city's challenge is not producing a premium agricultural product. It is converting high-volume roadside footfall into slower, higher-margin tea demand.
That is why Iruma keeps doing niche construction. It stages tea-focused campaigns, built the reservation-only Cha no Wa tea-field terrace, and tries to turn passing shoppers into visitors who will spend time in the landscape rather than only in the parking lot. The mechanism is source-sink dynamics moderated by network effects. Mycorrhizal fungi are the right analogue: they survive by building hidden connections that move nutrients from crowded nodes into places that would otherwise stay underfed. Iruma is trying to build the same connective tissue between mass retail and a tea economy that cannot live on heritage alone.
Iruma says about 4 million people visit its outlet mall each year, yet the nearby tea district still lacks a destination strong enough to convert that traffic.