This authoritative and stimulating book represents a fundamental critique of the aggregate production function, a concept widely used in macroeconomics. The authors explain why, despite the serious aggregation problems that surround it, aggregate production functions often give plausible statistical results. This is due to the use of constant-price value data, rather than the theoretically correct physical data, together with an underlying accounting identity that relates the data definitionally. It is in this sense that the aggregate production function is 'not even wrong' it is not a...