Tamil Nadu ke chhote shehar apne cluster-model ke liye jaane jaate hain — Tirupur ka garments job-work network, Karur ka home-textile cluster, Erode ki turmeric mandi aur powerloom belt, Salem ka steel-sago trade, Namakkal ka egg-transport hub. Cluster ka matlab: ek order kai chhoti units se guzarta hai — cutting,