Batch cycle-003. Model 0.2.0, graph 0.2.0, parameters 0.1.1. 30 simulations, seeds 1 to 30; probes on 10. Every figure is a distribution over simulations of a structural model with seed parameter values; it shows what the model implies under these settings, not what will happen. Other nations are frozen at their 2026 ratings. No reconstructed historical data is used in this experiment.
Headline
South Korea played 30 rounds from 1996 under the scripted method, with scripted events, 30 times. Its capability index moved from 13.13 to a median of 12.72 (−0.40), with 90 per cent of simulations between 12.71 and 12.73 [experiment_objectives].
Starting position
In 1996 the nation ranks 21 on the index against the frozen field, holds 0 of nine domains at Tier 1 and has a tier rank of 22. Its base income is 649 credits a year, calibrated so that its 2026 position is affordable with headroom for investment.
What was decided
A simulation spent a median of 1,569 credits on moves. The five groups that took most were Semiconductors & Advanced Computing (build, 284 credits, 18.1 per cent); Connectivity, Cyber & Trust Technologies (build, 155 credits, 9.9 per cent); Trade Policy & Market Access (build, 127 credits, 8.1 per cent); Government Effectiveness & Public Administration (build, 127 credits, 8.1 per cent); Financial Stability & Crisis Management (build, 127 credits, 8.1 per cent) [experiment_decisions_by_group]. By mode: build 100 per cent [experiment_decisions_by_group]. Concentration of spending (HHI) had a median of 0.096, and the most repeated action appeared in 37 per cent of rounds.
The leading domain by period: rounds 1 to 5, Financial Strength; rounds 6 to 10, Critical Technology; rounds 21 to 25, Critical Technology; rounds 26 to 30, Critical Technology [experiment_spend_by_period].
What the world did
A median simulation saw 4 shocks and 0 upside events. The most damaging per firing were S10 (30 firings in 30 simulations, −25.3 points each); S02 (60 firings in 30 simulations, −14.9 points each); S01 (30 firings in 30 simulations, −14.3 points each) [experiment_shocks].
The groups that lost most to shocks, per simulation: Fiscal Capacity & Public Finance −2.25; Investment Attraction & Projection −2.21; Labour & Employment −2.19; Monetary & Currency Capability −2.11 [experiment_shock_damage_by_group].
The edges that carried most change through the graph, per simulation: Connectivity, Cyber & Trust Technologies to Cyber & Electromagnetic Operations (+0.50 points); Financial Regulation & Integrity to Financial Infrastructure (+0.38 points); Fiscal Capacity & Public Finance to Social Infrastructure (−0.42 points) [experiment_propagation_by_edge].
Where it ended
At 2026 the median rank is 23 (5th to 95th percentile 23 to 23), the median count of Tier 1 domains 2 (2 to 2) and the median tier rank 8; the resilient score, the mean score sum over simulations, is 930 [experiment_objectives].
Tier 1 probability changed most in: governance and integrity (0 to 100 per cent of simulations); strategic infrastructure (0 to 100 per cent of simulations) [experiment_tiers_by_round].
Why
Without shocks the index ends +1.060 higher on average, so the shocks cost about 1.060 index points [experiment_probe_attribution].
Holding instead of following this method changes the index by −0.840: that is the method's worth against doing nothing [experiment_probe_attribution].
Removing any single one of the five largest actions changes the index by between −0.036 and +0.017, for example 1997 build Financial Stability & Crisis Management (32 credits) [experiment_probe_attribution]. The largest actions by credits come late, when income is highest, and are rarely the most valuable.
Removing the largest shock of a simulation raises the index by +0.370 on average [experiment_probe_attribution].
The replay probe reproduces the simulations exactly (index change 0.000000), so the attributions are clean [experiment_probe_attribution].
Surprises
tier_jump (warn): largest gain in one domain within five years: 6 tiers (30 simulations above 2); tiers are reported, not an objective.
retired_words (warn): e4-kor/report.md: 'simulations' 1 time(s), first near line 39; use 'simulations'.
The simulation furthest from the median (seed 14) ends −0.02 from it, with 4 shocks and 0 upside events [experiment_outlier_simulations].
Comparison
This is the baseline (hold) experiment, or there is none for this nation in the batch.
Against history: from a reconstructed index of 13.13 the model ends at 12.72, where the 2026 ratings put it at 16.00. Group scores miss by 3.52 points on average, against 2.86 for assuming nothing changed (skill −0.23); the change in each domain has the right sign in 11 per cent of domains. Furthest below history: information and influence (−4.06); furthest above: strategic infrastructure (−2.58) [experiment_against_history]. The starting position is reconstructed, so part of the error is the reconstruction's.