"What intrigues us as a problem, and what will satisfy us as a solution, will depend upon the line we draw between what is already clear and what needs to be clarified," Nelson Goodman.
State Space Models
Friday, November 14, 2025
Thursday, November 13, 2025
Tuesday, November 4, 2025
US (1960-2100) If Things are so Great, Why is Hardship in the US Increasing?
Measurable Hardship in the US (graphic above), is increasing and projected to increase until 2025. If US economic performance is so great, why is this happening? And, why does Hardship decrease after 2025 in the estimated model (see the Boiler Plate) above?
Quantitative Counterfactual Analysis indicates that impacts from growth in the World System are driving Hardship in the US. Decline in Hardship after 2025 is the effect of slowing growth in the World System. In other words, Growth in the World System has increased Hardship in the US even though the US is the Hegemonic leader of the World-System.
Part of the reason is that the current US Administration (Trump II) is cutting benefits for SNAP (Food Stamps) and other US Welfare programs. Why "millions of Americans" have to be on food assistance in the first place is a question that bothers me and the answer has to do with World-System forces.
Notes
Hardship Index
World-System (1970-2100) World Population Collapse
October 27, 2025. NPR ran a segment on how Populations are Shrinking and Altering the Global Economy. It is somewhat surprising that Population Decline has not been bigger news. It has been going on in many countries and for the entire World System (graphic above with 98% bootstrap prediction intervals).
The basic theoretical model underlying the possible impact of Population Decline is the Kaya Identity (above) used by the IPCC to help understand Global Temperature Change. The Kaya Identity is true by definition (see the Boiler Plate) so any decrease in Population will not only decrease economic growth (Q) but also decrease CO2 emissions and moderate Global Temperature (T).
Exercises
Wednesday, October 15, 2025
World-System (1980-2100) Will Political Instability Hurt the French Economy?
French GDP is forecast to grow until about 2045 and then collapse after that.
Possibly the most concerning aspect of the GDP forecast is the collapse starting around 2045. Why is the French Economy forecast to be in Growth-and-Collapse mode?
One charitable analysis of current French Political Instability is that it is part of a Random Walk walk process to find a different Geopolitical Alignment. There is no guarantee that the process will end in a Steady State Economy.
You can experiment with the FRL20 BAU model here and explore alternative futures.
Notes
AIC Statistics
Thursday, October 9, 2025
World-System (1970-2150) Six Futures for Colombian Growth
Colombian President Gustavo Petro has said that a boat recently bombed by the US was "Colombian with Colombian citizens inside", an allegation the White House called "baseless".
To provide some background to Trump's legally questionable military actions in International Waters, it would seem useful to understand the Economy of Colombia and how it might be affected by possible US military action. Google AI provides the following overview:
Notes
Economy of ColumbiaTuesday, September 30, 2025
A More Detailed Look at the Economy of Portugal
Notes
World-System (1960-2100) Venezuela Growth Forecast
Notes
World System (1940-2040) Inflation in Venezuela
Monday, September 29, 2025
Thursday, September 25, 2025
World-System (1970-2100) Latin American Futures
- BAU The Business as Usual model (which you can run here) is cyclical but has the best growth out to 2100.
- TECHE The Technical Efficiency model is stable and a strong contender (AIC = -160.3, smaller is better).
- TECHP The Technical Productivity Model is also stable and has one of the best statistics (AIC = -264.3). This model is the Systems Theory analog of the Neoclassical Economic Growth Model with erogenous technological change.
- US The model drive by the US is also stable, cyclical and an obvious contender given the history of Latin America (AIC = -85.96).
- RW In the short run, the Random Walk is a strong contender (AIC = -108.1)
- W The World System input model is stable, cyclical and also a strong contender (AIC = -71.53). Unfortunately, it leads to collapse starting in the very near future.
Notes
Friday, September 19, 2025
World-System (1980-2100) Six Forecasts for the United Kingdom
The US and the United Kingdom (UK) recently signed a Technological Prosperity Deal (I posted about the Deal here). After Brexit (the withdrawal of the UK from the European Union, EU), it seems that the purpose of the deal is obvious: the UK needs friends and Geopolitical Alliances after having essentially snubbed the EU. The US is the obvious next choice. But, the question remains: what would be the best Geopolitical Alliance for the UK? This post explores that question using the UKL20 Model (for more information about how the model was created, see the Boiler Plate).
The best Geopolitical Alliance for the UK is none, that is, to remain independent in the World-System and conduct Business as Usual (BAU) muddling through as necessary (RW).
In the graphic above are six growth forecasts for the UK1 state space component. From the Political Perspective, the UK-BAU Business As Usual models are the best, better than staying linked to the EU (a rationale for Brexit). The BAU models are unstable (largest eigenvalue greater than 1.0). The weaker models (EU, US, and W) are all stable and lead eventually to a Steady State Economy (a better result for reducing Environmental Degradation). The best short-term, year-to-year model is the Random Walk (RW), just muddling through.
You can experiment with the UKL20 Model and investigate the Technology models (TECHE and TECHP) here.
Notes
- RW Random Walk [11.69 < AIC = 20.71 < 30.63]
- BAU Business As Usual [81.86 < AIC = 87.22 < 91.8 ]
- W World WL20 Input [34.58 < AIC = 60.83 < 82.67]
- US USL20 Input [29 < AIC = 63.25 < 90.17]
- UK UK2_UK3 BAU Input [83.88 < AIC = 89.88 < 94.15]
- EU European Union [60.47 < AIC = 79.99 < 97.75]
- TECHP Technical Productivity [27.43 < AIC = 48.29 < 66.77]
- TECHE Technical Efficiency [61.16 < AIC = 73.08 < 82.33 ]
Thursday, September 18, 2025
World-System (1960-2100) Technological Change in the United Kingdom
On September 18, 2025 Donald Trump and Keir Starmer signed a Technological Prosperity Deal between the US and the UK covering joint technological advancement. Aside from giving the US President a chance to ride in the Golden State Carriage with King Charles, what was the motivation for the visit and the Technological Prosperity Deal?
The Economy of the UK is driven by Technological Productivity (TECHP) change; without accelerated Technological Productivity growth, the UK is facing a Steady State Economy or even Limits to Growth.
In this post, I present results from the UKL20_TECHP model to explain the forecast. The TECHP Indicators and index construction are explained in the Notes.
The Technological Prosperity Deal is an attempt to put off the steady state and approach the 98% upper confidence interval where TECHP reaches a much higher level, but still a steady state.
Notes
The System matrix for the full UKL20_TECHP model:
The UKL20 Model Measurement Matrix is presented below (TECHP is one of the better drivers for the UKL20 Model--see the Akaike Information Criterion statistics below).
- RW Random Walk [11.69 < AIC = 20.71 < 30.63]
- BAU Business As Usual [81.86 < AIC = 87.22 < 91.8 ]
- W World WL20 Input [34.58 < AIC = 60.83 < 82.67]
- US USL20 Input [29 < AIC = 63.25 < 90.17]
- UK UK2_UK3 BAU Input [83.88 < AIC = 89.88 < 94.15]
- EU European Union [60.47 < AIC = 79.99 < 97.75]
- TECHP Technical Productivity [27.43 < AIC = 48.29 < 66.77]
- TECHE Technical Efficiency [61.16 < AIC = 73.08 < 82.33 ]







