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This paper empirically assesses the degree to which current cost data as required by Financial Accounting Standards Statement No. 33 might implicitly be used by equity market participants. Studies to date, focusing on income measures, documented little or no effect of the data on prices. We argue here that income was the wrong focus. Instead, because current costs can be used to construct quantity indexes and hence measure real productive growth of the firm, the focus should be on the test of association between real productivity (obtained by use of current cost data) and stock returns rather than between income measures and stock returns. Therefore, this paper tests for whether growth measure (of real productive output) which can be obtained by utilizing current cost information and which cannot be obtained without such information, can explain cross-sectional variation in security returns beyond measures based on historical costs. Returns should be more highly associated with current cost based measures of real productive growth than with similar measures based on historical cost, if the current cost data have value. Like the time-series macroeconomic analysis done by Fama (1981), our cross-sectional microeconomic analysis relying on current cost accounting data suggests that security returns are positively related to real productive activity. Moreover, the tests seem to suggest that current cost data, on the margin, reflect productive activity information that may not be already contained in historical cost accounting data. [ABSTRACT FROM AUTHOR]