Research on the Tendency Relationship between Individual Stock and Stock Index

This paper mainly centers on exploring the tendency relationship between individual stock and index using CAPM method. The research chooses of Apple Inc. as an S&P 500 index. Then is used to tests indicating that this model does not fit rate return very well. Therefore, explores possible reasons behind phenomenon refers some constructive improvements in evaluation expected stocks under influence One reason probably AAPL so powerful a corporation it extremely immune anomalous volatility market, which implies unsystematic risk dominates trend suggests should only be applied when target company small-sized or medium-sized one prone fluctuation market.