What is the primary goal of an active mutual fund manager?

What was a significant challenge faced by John C. Bogle during the launch of the first index fund?

According to the provided text, what is a key reason why index funds are generally more cost-effective than actively managed funds?

What is the central argument presented in the text regarding the concept of markets as a "zero-sum game" in the context of active fund management?

What is the primary reason cited in the text for the limited availability of debt index funds in India?