The trainer market is more diverse and competitive than ever before, and its biggest player has felt the pinch.While new brands have been popping up and taking market share, Nike suffered its biggest single day drop in share price on record in late June. A whopping $28bn (£21.6bn) was shaved off in market capitalisation overnight after the company's management reported an expected sale drop in early 2025.But why has this happened?Nike remains the biggest sports retailer in the world and still has the larges ...