Applying these estimates to the balance sheet disclosures of all the firms used as samples provides them with estimated liquidation values. In the empirical results, they report that after controlling for the option’s exercise price, the market value of a firm’s equity increases in a close approximation one for one with increases in the present value of after-interest cash flows. The significant positive estimate on the excess liquidation value movements continues to support the inference that the abandonment option makes a more important and significant contribution to the market value of a firm’s equity than that made by the present value of cash flow.To investigate the change over time in the association between abandonment option value and liquidation value, and to solve that problem that the pooled observations may not be independent, because it includes the same firm for many years. The results of their further research continue to show a positive, strong relation between the estimated liquidation value and the market value of the firm’s equity. Moreover, to further reduction of the concern that the inferences may be influenced by the liquidation value measure capturing a portion of true present value of cash flow that is omitted from their proxy, they perform an analysis in changes.