Stock indices were created to accurately reflect changes in the prices of stock exchange securities included in them.Indices are divided into price-weighted and value-weighted indices.In price-weighted indices,each se...Stock indices were created to accurately reflect changes in the prices of stock exchange securities included in them.Indices are divided into price-weighted and value-weighted indices.In price-weighted indices,each security has the same impact on the index,which is the arithmetic mean of the stock values of the companies it comprises.A value-weighted index accounts for changes in the value of shareholdings.By choosing the right composition of share packages,one can change the impact of a given security on the index.Market dynamics also change the composition of the index by removing securities and replacing them with others.The impact on the index grows as the price of a given security increases.Recently,index values have been strongly influenced by new technology companies,which have greatly appreciated during the SARS-CoV-2 pandemic.The aim of this work is to show the changes in two indices in particular:US NASDAQ Composite,and the new competitive SSE STAR index,an index from the Shanghai Stock Exchange.展开更多
文摘Stock indices were created to accurately reflect changes in the prices of stock exchange securities included in them.Indices are divided into price-weighted and value-weighted indices.In price-weighted indices,each security has the same impact on the index,which is the arithmetic mean of the stock values of the companies it comprises.A value-weighted index accounts for changes in the value of shareholdings.By choosing the right composition of share packages,one can change the impact of a given security on the index.Market dynamics also change the composition of the index by removing securities and replacing them with others.The impact on the index grows as the price of a given security increases.Recently,index values have been strongly influenced by new technology companies,which have greatly appreciated during the SARS-CoV-2 pandemic.The aim of this work is to show the changes in two indices in particular:US NASDAQ Composite,and the new competitive SSE STAR index,an index from the Shanghai Stock Exchange.