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We investigate the relations among voluntary disclosure, earnings quality, and cost of capital. We find that firms with good earnings quality have more expansive voluntary disclosures (as proxied by a self-constructed index of coded items found in 677 firms' annual reports and 10-K filings in fiscal 2001) than firms with poor earnings quality. In unconditional tests, we find that more voluntary disclosure is associated with a lower cost of capital. However, consistent with the complementary association between disclosure and earnings quality, we find that the disclosure effect on cost of capital is substantially reduced or disappears completely (depending on the cost of capital proxy) once we condition on earnings quality. Extensions probing alternative proxies show that our findings are robust to measures of earnings quality and cost of capital, but not to other measures of voluntary disclosure. In particular, we find opposite relations for voluntary disclosure measures based on management forecasts and conference calls, and we find no relations for a press release based measure. * Fuqua School of Business, Duke University. We appreciate comments from workshop participants at

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Just-In-Time manufacturing has been subjected to numerous studies both empirical and methodological. This work attempts to measure the impact of JIT on accounting measures of performance. Most technologies and investments are justified on the basis of their impact on financial and accounting measures which are not easily quantified. Our empirical methodology, simultaneous equation estimation, allows us to isolate the partial effects of JIT on various accounting measures thus gauging the true impact of this method on firm performance. Our results show that after JIT adoption firms reduced the labor content in facilities, increased inventory turnover and enhanced earnings. There was no significant impact on prices charged by the firm. These results support the anecdotal evidence on JIT and the theoretical work done by various authors. Even though the firms studied experienced a downturn in their performance our empirical methodology could identify positive benefits resulting from JIT adoption. 0272-6963/95/$09.50 © 1995 Elsevier Science B.V. All rights reserved SSDI 0272-6963(95)00011-9

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