The present article aims to evaluate the relationship between economic spread and market value for all firms, except financials, listed in the Athens Stock Exchange over the period 2000~2004. Specifically, this relationship was examined both on a whole market and on an industry basis. The sample firms were classified into six industries, namely consumer cyclical, basic materials, consumer non-cyclical, industrial, technology, and communications. In doing so a regression analysis was performed having economic spread as the independent variable and the ratio of market value over the invested capital as the dependent variable. Economic spread is defined as the difference between the return on invested capital and the weighted average cost of capital and indicates the net return a firm achieves for the capital it uses in its operations. Market value of a firm is defined as the sum of the market value of equity plus the market value of debt. The results for the whole market showed that there is a statistically significant positive relationship between economic spread and market value in 66.67% of the cases. On the industry basis the results showed a positive relationship between the two variables in all sectors except the technology one.