India, Oct. 22 -- After the announcement of its results in October, Tata Consultancy Services (TCS)'s market valuation rose to $144.7 billion, pipping Accenture at $142.4 billion and IBM at $110.5 billion. All at once, TCS has become globally the most-valued company in its market segment, IT services. What does the achievement mean? Who are the global market leaders in other sectors? How big is the $100-billion-dollar market capitalisation club? And how has it evolved in the last two decades?...