The Comovement of Investor Attention

Prior literature has documented that investor attention and constraints on that attention are associated with the pricing of stocks. We introduce the concept of attention comovement, which is the extent to which investor attention to a firm is explained by attention paid to the firm's industry and the market in general. We find that attention comovement is nontrivial for the average firm and is related to firm characteristics, such as size and visibility. We also find that the comovement of investor attention has market consequences, in that it is positively associated with excess stock return comovement. Finally, we show that a firm's earnings announcement contributes to the transfer of attention from one firm to its peer firms. Our results provide insights about the information flows underlying return comovement and aid in understanding the micro and macronature of investor attention.