India just had a reality check on what happens when two players dominate an entire market. IndiGo—the country's biggest carrier—suddenly canceled waves of flights last week, leaving tens of thousands of travelers stranded. The mess wasn't just an operational hiccup. It exposed something deeper: when you've got what's basically a duopoly controlling the world's fastest-growing aviation sector, a single point of failure can ripple into total chaos. One airline stumbles, and suddenly the whole system's fragility shows. It's a textbook case of concentration risk—whether we're talking airlines, crypto exchanges, or any market where a handful of giants hold all the cards. Growth's great, but resilience? That's another story.