In this paper, we intend to offer a critical review of the different concepts of capital and the different methods which are used to measure it. At the same time, we propose an endogenous approach which tries to measure the capital stock in terms of value, explicitly referring to depreciation as an economic variable decided by the firm. Applying this procedure to the Spanish macroeconomic data, we observe a big capital destruction since the mid-seventies which is not mentioned in official statistics.
