The supposed preference of firms for internal financial sources to fund their investments can be explained by either the free cash-flow or the financial constraints theories, both relying on asymmetric information. Neither theory was found fully valid by recent research. Using a French
data panel, conclusive evidence will be made in favour of the free cash-flow theory in special cases. The validity of the free cash-flow theory in special cases will bring new issues to light with the introduction of a new definition: soft budgeting problem of capital. Through this analysis,
the possible interaction between capital market imperfections and general equilibrium will also gain new dimension.