MiddleAges500-1500

  Notes Galor, Oded (2011).  Unified Growth Theory . Princeton: Princeton University Press.   Boulding, K. (1955)  The Malthusian Model as a General System The Malthusian Controller (Q-N) System Theoretic interpretation of the Malthusian Model. For more information about data sources how the state space models were estimated  see the  Boiler Plate . You can run the  WE_MA BAU Model  on my Google Site  here . Instructions in the  R-code  explain how to modify the model.   You can run the  W_MA BAU Model  on my Google Site  here . Instructions in the  R-code  explain how to modify the model. Wikipedia WE_MA Measurement Model The  Western European Middle Ages  WE_MA BAU Model   has three component state variables that explain 100% of the variation in the indicators. The first component is WE1 = (Overall Growth). The second component is WE2 = (Q-U) an Urban-Production Controller. The ...

  May 17, 2026 Katya Ungerman writes in the NY Times that  We Are Sliding Back Into the Middle Ages . People are giving up on Science, embracing the existence of the Supernatural and worrying about demonic possession. My first thought was "what was driving society in the Middle Ages (500-1500) and what similar drivers can we see in the present (a hard question to answer)"? My second thought was "what does Systems Theory have to say about the Social System in the Middle Ages compared to the present (an easier question)"? The Middle Ages were a period of "muddling through" ( Random Walk ) trying to find an attractor path for the Industrial Revolution. The British found it first (see the Boiler Plate ). The  W_MA Model  was estimated from the Maddison Project data set. Three versions of the model are available in R-code on my Google site ( here ): A Business-As-Usual ( BAU ) model, A Random Walk ( RW ) Model and a Stabilized BAU Model (instructions i...