Editing Input–output model (section)

=== Further research ===

There is extensive literature on these models. The model has been extended to work with non-linear relationships between sectors.<ref>{{Cite journal |last=Sandberg |first=I. W. |date=1973 |title=A Nonlinear Input-Output Model of a Multisectored Economy |url=https://www.jstor.org/stable/1914043 |journal=Econometrica |volume=41 |issue=6 |pages=1167–1182 |doi=10.2307/1914043 |jstor=1914043 |issn=0012-9682|url-access=subscription }}</ref> There is the Hawkins–Simon condition on producibility. There has been research on disaggregation to clustered inter-industry flows, and on the study of constellations of industries. A great deal of empirical work has been done to identify coefficients, and data has been published for the national economy as well as for regions. The Leontief system can be extended to a model of general equilibrium; it offers a method of decomposing work done at a macro level.