America's next grocery shock is brewing

America's grocery squeeze has thus far been most painfully felt in a few expensive categories, like beef, coffee and chocolate. Now, the forces pushing up food prices are starting to pile up: expensive grain, soaring fertilizer and fuel, plus unpredictable weather and raging wars. Why it matters: The next grocery price shock could hit much harder — and much wider. The big picture: Your grocery store is fed by a vast global supply chain, and pressures are building all along it. The Iran and…