“…In fact, when it comes to estimating the contribution of energy to economic growth, the literature is well aware of the limitations of GDP in measuring economic activity: Energy, as evaluated by market prices, would only be represented in terms of value added of the energy sector, and therefore appears to be much less significant as a driver of growth than other economic inputs, in particular labor, because the contribution of energy industries to total GDP is small; this reasoning can be theoretically undergirded if the assumption is made that the neoclassical cost share theorem applies (which is problematic) [15]. Accordingly, researchers who wish to expose the role of energy in growth do not use the market valuations but material measures of energy input, thus actually mixing up different measurement standards (in the corresponding production functions, capital is measured in monetary terms, labor in hours per annum, and energy in physical magnitudes, with different specifications, see e.g., [16]; [5]: 197ff, 334ff; [6]: 205ff, 262ff, who, however, proceeds with transformations into dimensionless magnitudes via referring to a base year).…”