Flash sales in India operate in two distinct layers that rarely overlap.
Layer A — Institutional quick-commerce: Blinkit, Zepto, Swiggy Instamart, and BigBasket run algorithm-driven inventory cycling with dark-store infrastructure. Their operations are software-native (real-time inventory sync, dynamic pricing, route optimization). Time and money leak through last-mile delivery costs (each order below ₹300 is unprofitable at current delivery fees), high customer acquisition spend, and perishables waste that averages 8–15% for grocery categories according to industry operational disclosures.
Layer B — Informal flash sales: This is the larger universe by count. It includes:
- Restaurant owners clearing tomorrow's unsold inventory via WhatsApp groups (evening biryani at 60% discount, announced at 6 PM)
- Wholesale markets (Nehru Place electronics, Sarojini Nagar garment clearances) where brokers announce lot deals via WhatsApp broadcast lists
- kirana shops running "flash hours" for perishables with short shelf lives
- Small manufacturers and brand owners clearing excess stock through reseller networks
- Event ticketing flash windows for concerts, pop-ups
- The merchant or their staff runs WhatsApp broadcast lists (sometimes 3–5 lists of 256 contacts each)
- A "broker" or "ordinator" in wholesale markets manages a WhatsApp group of resellers, collects orders via voice note, and tracks payments in a Google Sheet or a physical register
- Delivery is handled via the merchant's own delivery person, or buyers self-pickup, or a Rapido/Dunzo跑腿 run is arranged ad hoc
- WhatsApp (primary channel — broadcast lists, groups, voice notes)
- Google Sheets (order tracking, inventory counts)
- Phone calls and voice notes (payment confirmations, address collection)
- Excel on PC for wholesale lots with multiple SKUs
- Google Forms for order collection (uncommon, but used by some textile clearances)
- No dedicated flash-sale management tool — everything is repurposed from general-purpose software
- Order confirmation is manual — a buyer replies "1" and the merchant counts it, risking miscommunication
- Payment tracking is separate from order tracking — a WhatsApp message "paid" has no link to a specific order
- Inventory visibility is zero — the merchant doesn't know what sold until the window closes or the group goes quiet
- Delivery coordination is ad hoc — no address standardization, no status update to buyer
- Reseller networks are held together by personal trust, not systems — a broker leaving means contacts leave