Monotonicity conjecture for the optimal regulation measure

Let ηˉ1\bar{\eta}_1 and ηˉ2\bar{\eta}_2 be cumulative-effort constraints satisfying 0<ηˉ1<ηˉ20<\bar{\eta}_1<\bar{\eta}_2, and let μαopt,ηˉi\mu_{\alpha_{opt},\bar{\eta}_i} be the measures associated with the corresponding optimizing solutions αopt,ηˉi\alpha_{opt,\bar{\eta}_i}. For t<st<s, write μαopt,ηˉi([t,s))=αopt,ηˉi(s)αopt,ηˉi(t)\mu_{\alpha_{opt},\bar{\eta}_i}([t,s))=\alpha_{opt,\bar{\eta}_i}(s)-\alpha_{opt,\bar{\eta}_i}(t). Monotonicity conjecture. The measure μαopt,ηˉ2\mu_{\alpha_{opt},\bar{\eta}_2} dominates μαopt,ηˉ1\mu_{\alpha_{opt},\bar{\eta}_1} in the sense that

μαopt,ηˉ1([t,s))μαopt,ηˉ2([t,s)).\mu_{\alpha_{opt},\bar{\eta}_1}([t,s))\leq\mu_{\alpha_{opt},\bar{\eta}_2}([t,s)).

Equivalently,

αopt,ηˉ1(s)αopt,ηˉ1(t)<αopt,ηˉ2(s)αopt,ηˉ2(t).\alpha_{opt,\bar{\eta}_1}(s)-\alpha_{opt,\bar{\eta}_1}(t)<\alpha_{opt,\bar{\eta}_2}(s)-\alpha_{opt,\bar{\eta}_2}(t).

The conjecture would provide a unified explanation for the numerically observed monotonicity of the support, the absolutely continuous density, and the atomic masses of the optimizing measure as the cumulative-effort constraint increases; these observations are not yet proved by the analytical results.

Sources & referencesView supporting material

Primary source

Nir Gavish and Guy Katriel, “Optimal regulation in a periodic environment: insights from a simple model”, arXiv:2502.06267 (2025).

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