Raipur ke scrap-metal-business mein ek typical-chain hoti hai: chhote-informal-collectors (jo local-area se scrap-collect karte hain) ise formal-registered-traders ko bechte hain, jo aage-industrial-buyers ko supply karte hain. Har-stage par payment ka pattern alag hota hai — collector-se-trader ka transaction usually-cash-based hota hai, jabki trader-se-industrial-buyer ka transaction formal-invoice-based. Ye guide dono-stage explain