The R-square of the market model is a very popular measure of stock price efficiency. However, its interpretation is far from being unambiguous. Some scholars argue that the R-square is a direct measure of efficiency, others argue that the R-square is an indirect measure of efficiency. This paper contributes to the literature in two ways. First, we model the relationship between the market model R-square and the delay in the price discovery process and, second, we find that the correlation between R-square and delay is consistently negative. We conclude that the R-square is a direct measure of price efficiency.
Original languageEnglish
Pages (from-to)N/A-N/A
JournalReview of Quantitative Finance and Accounting
Publication statusPublished - 2013


  • Delay
  • Price efficiency
  • R-square


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