The ideas of Market Potency confer with the market costs replicate all obtainable relevant information. if the market area unit is economical, than all information is already incorporates into cost and then there are no thanks to beat the market as a result of there aren't any below or overvalued securities obtainable Market potency was developed in 1970 by social scientist Eugene Fama whose theory of economic Market Hypothesis (EMH) expressed its out of the question for associate capitalist to outdo the market which market anomalies mustn’t exist as a result of they will straight off be arbitrage away. Fama later won the award for his efforts. Investors World Health organization trust this theory tend to shop for index funds that track overall market performance and area unit proponent of passive portfolio management. Investors and lecturers have a good vary of read purpose on the particular potency of the market as mirrored within the robust (strong), Semi-Robust (Semi strong) and weak versions of the Efficient market hypothesis. Believers that the market is powerful area unit people who trust the FAMA and sometimes carriers with it passive index investors. The main objective of the study is to look at the behaviour of stock price within the Indian Stock market once the introduction of the varied sectors of selected NSE Market in India Victimization totally different methodologies. The objective of the study square is measured as follows. To analyse the stock prices of CNX Nifty and sectoral Indices in National Stock Market of India. To examine the relationship between selected sectors in NSE Market. To study the cause and effect relationship between the sectoral Indices in NSE market. To investigate the Semi robust variety of market potency in National Stock Market. The study is an empirical research for which Semi Robust form of market potency of CNX Nifty and Sectoral Indices of National Stock Exchange of India are tested. The current study investigates the relationship, Co-Integration, cause and effect, relationship, semi-robust market potency and volatility among the NIFTY and Sectoral Indices of National Stock Exchange. Finally the study concludes with all the sectoral indices with CNX NIFTY the stock market potency are tested. It showed that the Indian Stock Market is not potency in Semi-Strong Form. NSE Sectoral Indices helps the investors to identify the leading sectors like Finance, FMCG, Media, Metal, Pharma and Realty which have semi-robust market potency. It will help the investors to earn more abnormal profits in the long run and put an effort in favour of a shift to dynamic business environment where one can manage risk and earn even above normal profits at least at present time. Hence it provides an opportunity to the traders for predicting the future prices, shares and stock turnover for earning more profits on these sectors. From this the investors and portfolio managers can decide their trading strategy based on the sectoral indices to change their dynamic business environment
