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Basu's ["The Conservatism Principle and the Asymmetric Timeliness of Earnings." Journal of Accounting and Economics 24 (1997): 3-37] measurement of conditional conservatism as the asymmetric timeliness of earnings underlies hundreds of studies. However, many subsequent studies cast doubt on the extent to which Basu's measure captures conditional conservatism versus statistical biases or alternative constructs (collectively, "biases"), thereby questioning the validity of the inferences that empirical researchers draw from analyses using the measure. We modify Basu's measure in four simple ways to remove these biases. Our key modification is the inclusion of interactive

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The question we address is whether mandated disclosure about dispersion of nonfinancial asset values can provide information relevant to assessing firm risk. Using a sample of Canadian oil and gas (O&G) firms between 2004 and 2011, we find that the difference between the disclosed 10th and 50th percentiles from the O&G reserves distribution, which measures dispersion of the distribution, is positively associated with future total and idiosyncratic equity return volatility, systematic risk, and credit risk. We also find that disclosure of increased reserves dispersion is associated with weaker stock price reactions to increases in reserves and with increases in bid-ask spreads, both of which indicate the disclosures convey information about risk associated with reserves. Additional tests reveal little evidence of managerial opportunism in the reserves disclosures. Taken together, our evidence suggests that quantitative disclosures about the dispersion of nonfinancial asset values can provide information relevant to assessing firm risk.

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