Feasibility-First Satellite Integration in Robust Portfolio Architectures
Roberto Garrone
TL;DR
This paper tackles the challenge of integrating thematic satellites into small, robustness-oriented core–satellite portfolios by reframing satellite inclusion as a feasibility problem rather than a forecasting or optimization exercise. It introduces a four-layer, non-predictive framework—physical, economic, structural, and epistemic—that governs admissibility, along with a tiered asset structure (Tier A/B/C) and GAER domain conditioning to preserve governance and interpretability. The key contributions are the hierarchical feasibility blueprint, closed-form bounds on satellite size, turnover, and breadth, and the integration pathway with SMDT and GAER architectures. The framework clarifies how satellites can express bounded long-horizon optionality while avoiding fragility from over-optimistic forecasts or complex governance demands, offering a disciplined, auditable approach for small portfolios.
Abstract
The integration of thematic satellite allocations into core-satellite portfolio architectures is commonly approached using factor exposures, discretionary convictions, or backtested performance, with feasibility assessed primarily through liquidity screens or market-impact considerations. While such approaches may be appropriate at institutional scale, they are ill-suited to small portfolios and robustness-oriented allocation frameworks, where dominant constraints arise not from return predictability or trading capacity, but from fixed costs, irreversibility risk, and governance complexity. This paper develops a feasibility-first, non-predictive framework for satellite integration that is explicitly scale-aware. We formalize four nested feasibility layers (physical, economic, structural, and epistemic) that jointly determine whether a satellite allocation is admissible. Physical feasibility ensures implementability under concave market-impact laws; economic feasibility suppresses noise-dominated reallocations via cost-dominance threshold constraints; structural feasibility bounds satellite size through an explicit optionality budget defined by tolerable loss under thesis failure; and epistemic feasibility limits satellite breadth and dispersion through an entropy-based complexity budget. Within this hierarchy, structural optionality is identified as the primary design principle for thematic satellites, with the remaining layers acting as robustness lenses rather than optimization criteria. The framework yields closed-form feasibility bounds on satellite size, turnover, and breadth without reliance on return forecasts, factor premia, or backtested performance, providing a disciplined basis for integrating thematic satellites into small, robustness-oriented portfolios.