“…Some authors find that managers are more likely to provide forecasts when their firms' underlying earnings performance is strong (e.g., Patell, 1976;Penman, 1980;Lev and Penman, 1990;Miller, 2002) while other authors find that there is also a ARTICLE IN PRESS 4 We acknowledge that most disclosures are not literally voluntary, in the sense that economic forces are likely to compel managers' disclosures (Heitzman et al, 2008) but use the term to refer to non-mandated disclosures (i.e., disclosures other than those required on a regular basis by the securities laws). For example, the evidence in Noe (1999), Cheng andLo (2006), Billings (2008), and Rogers (2008) shows that managers' disclosure decisions are sometimes made in conjunction with their own trading decisions to enhance the profitability of those trades, subject to constraints imposed by the securities laws.…”