Sims, Christopher A.2009-10-222009-10-221971-08Sims, C.A., (1971), "Are There Exogenous Variables in Short-Run Production Relations?", Discussion Paper No. 10, Center for Economic Research, Department of Economics, University of Minnesota.https://hdl.handle.net/11299/54270en-USAre There Exogenous Variables in Short-Run Production Relations?Working Paper