# Here the inter industry transaction

Fig. 1. Calculation process of a hybrid unit input–output model.Figure optionsDownload full-size imageDownload as PowerPoint slide

2.3. Environmentally extended input–output model

To include also renewable AVE 0991 carriers and emissions, the model is environmentally extended. Fig. 2 and Eq. (3) show the calculation process. Matrix M records all ecological input parameters by product group, in this case renewable energy carriers. In contrast, Matrix N or its transpose matrix N'N', lists all ecological output parameters or rather greenhouse gas emissions. Both matrices are stalk combined in E and normalized in D. Vector b shows the cumulative demand or emission of the respective ecological parameter associated with the final demand y.equation(3)b=[MN']xˆ−1Cy=Exˆ−1Cy=DCy

Fig. 2. Calculation process of an environmentally extended input–output model.Figure optionsDownload full-size imageDownload as PowerPoint slide

2.4. Implementation of fixed assets