settled-reach/tooling/econ-sim/target/debug/build/libsqlite3-sys-027cdfcd1b5b0ef2/root-output at fb87f933f53f3f5ebf1ddda389ca3e595206acfa - settled-reach - tower-of-joy

jpmschweitzer/settled-reach

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jpmschweitzerandClaude Sonnet 4.6 fb87f933f5 feat(simulation): add economics simulation binary with Layer 1+2 (#806 , #807 )

Adds tooling/econ-sim — a standalone Rust binary for the Phase 2 economics
simulation:

Layer 1 (Leontief production, #806):
- Deterministic per-run PRNG seeding of corp×site productivity (D-176)
- Fixed-coefficient production chains; scarcity cascades downstream (D-178)
- Per-capita population demand for finals and services
- Gate-energy demand reduction for fusion_fuel at connected nodes (D-186)
- Price adjustment via local tâtonnement

Layer 2 (spatial price equilibrium, #807):
- Damped tâtonnement trade flows along gate links (α=0.03, β=0.4, D-178)
- 8% transport cost per hop damps long-distance arbitrage
- Flows computed from pre-step snapshot; applied atomically
- --stability-check implements D-179 Tests 1 and 2:
  · Test 1: cold-start convergence ±5% at tick 100 → PASS (max 1.05%)
  · Test 2: long-run stability ±2% over ticks 900–999 → PASS (max 0.00%)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-04-07 13:56:06 +02:00

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