Why have the biggest companies on earth risen and fallen? And sometimes risen again? What seems indestructible now, may be a failure in 10 years. Blackberry, K

Why have the biggest companies on earth risen and fallen? And sometimes risen again? What seems indestructible now, may be a failure in 10 years. Blackberry, Kodak, IBM, US Steel, Blockbuster, Direct TV. These companies are far smaller proportionally to what they once were. No one considers them empires, or on the cutting edge. Hand waving away the free market as corrupt ignores the perfect track record of capitalist societies vs. every other single system ever tried.