Abstract
We solve a multi-period model of strategic trading with long-lived information in multiple assets with correlated innovations in fundamental values. Market makers in each asset can only condition their price functions on trading in the that asset (but not on trading in the other asset). Using daily non-public data from the New York Stock Exchange we test the model's predictions on the conditional and unconditional lead-lag relations of institutional order flows and returns within portfolios. We find support for the model prediction of positive autocorrelations in portfolio returns as well as the predictions for how informed order flow positively predicts future returns and future informed order flow. As the model predicts we find these relations strengthen for portfolios formed from assets with higher correlation of fundamental values.
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