◆ Macro Policy · Inflation Analytics · Equity Valuation · D-Street Impact ◆ Goodbye WPI, Hello PPI: How India's New Inflation Index Changes Your Stock Valuation Models On June 15, 2026, India retires a 15-year-old measuring tape and picks up a laser level. Your portfolio should know the difference . By Sumon Mukhopadhyay | Published: 12 June 2026 ◆ WPI · PPI · DPIIT · RBI Policy · Inflation · Equity Valuation · Macro The metrics we rely on to judge corporate profitability and supply-side inflation in India are about to experience their biggest structural overhaul in over a decade. For fifteen years, the machinery of Indian macroeconomic analysis has run on a 2011–12 base year WPI — an instrument conceived when India's economy looked very different, before Jio arrived, before GST transformed indirect taxati...