The
NIFTY 50 is built on rigorous economic research, involving extensive
calculations to formulate its rules. The key findings of this research are
straightforward: (a) using a size of 50 is optimal, (b) stocks considered for
inclusion must meet liquidity criteria based on the 'impact cost', and (c) the
50 largest eligible stocks are selected for the index. This approach stands in
contrast to previous ad hoc methods used in index construction, which lacked a
scientific foundation and relied on intuition. The research behind the NIFTY 50
is internationally recognized as a pioneering effort in enhancing the
understanding of stock market index construction. For more details, refer to
"Market microstructure considerations in index construction" by Ajay
Shah and Susan Thomas, CBOT Research Symposium Proceedings, Summer 1998, pages
173-193.
The
closing prices of the NIFTY are determined by averaging the closing prices of
its constituent stocks over the last half-hour of trading, with weights applied
based on each stock's market capitalization.
Whenever
corporate actions occur, such as rights issues, public issues, or mergers,
there are changes in market capitalization that necessitate adjustments to the
weights. Additionally, when alterations are made to the index constituents,
portfolio adjustments are required, leading to modifications in weights. This
process demands detailed and consistently applied policies, which have received
significant attention and meticulousness at NSE Indices, and are openly shared
with the public.
Traditionally, indices have served as vital sources of information, providing insights into the state of the market. This informational role extends to various applications in economic research, particularly when an index offers current data and an investor's portfolio includes less liquid securities—here, the index acts as an indicator of the portfolio's overall performance.
In recent times, indices have gained prominence in finance due to their direct applications, notably in the form of index funds and derivatives. Index funds passively invest in the index, while index derivatives enable individuals to adjust their risk exposure to an index at a low cost (known as hedging) and make predictions about index movements (referred to as speculation). Hedging through index derivatives has become integral to modern risk management practices, resulting in a multi-trillion dollar industry globally that is intricately linked to market indices.
Furthermore,
indices serve as benchmarks for evaluating the performance of fund managers.
For instance, an all-equity fund is expected to achieve returns comparable to
the overall stock market index, while a balanced fund with a 50:50
debt-to-equity ratio should yield returns similar to a blend of 50% invested in
the index and 50% in fixed income securities. Establishing a well-defined
benchmark against which fund managers are measured is crucial for investor-fund
manager relationships, specifying how the fund manager's performance will be
evaluated.
The
most important type of market index is the broad-market index, consisting of
the large, liquid stocks of the country. In most countries, a single major
index dominates benchmarking, index funds, index derivatives and research
applications. In addition, more specialised indices often find interesting
applications. In India, we have seen situations where a dedicated industry fund
uses an industry index as a benchmark. In India, where clear categories of
ownership groups exist, it becomes interesting to examine the performance of
classes of companies sorted by ownership group.
Referees
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