Home bias in trade puzzle¶
The empirical finding that otherwise comparable regions trade far more within national borders than across them, leaving a large border effect after distance, size and standard gravity-model determinants are controlled.
Core Idea¶
The home-bias-in-trade puzzle is the unexpectedly large excess of domestic over international trade estimated after controlling for conventional trade determinants. Tariffs, regulation, currencies, information, networks, supply chains, language and model aggregation can make borders costly; estimation choices can inflate or reduce the residual border coefficient. The abstraction is therefore identified by a declared carrier, a transformation or constraint over that carrier, and an invariant that tells an analyst whether the named structure is genuinely present.
The load-bearing residual is not the broad topic of international economics. It is a quantitatively large border coefficient whose magnitude exceeds naïve expectations and demands institutional or measurement explanation.
Scope of Application¶
Home bias in trade puzzle belongs to international economics and is useful where the analyst can specify bilateral trade flows, regions, national borders, distance, economic size, policy and cultural covariates and a gravity-model specification, then evaluate domestic and cross-border flows are comparable and the home-bias estimate is conditional on a declared gravity model, geography, sector, period and multilateral resistance treatment. The scope is broad within that domain but bounded by the need for domestic and cross-border flows are comparable and the home-bias estimate is conditional on a declared gravity model, geography, sector, period and multilateral resistance treatment. The entry records a descriptive analytical identity; practical use requires the governing domain's evidence, standards, and safety obligations.
Clarity¶
The abstraction clarifies a crowded vocabulary by making domestic and cross-border flows are comparable and the home-bias estimate is conditional on a declared gravity model, geography, sector, period and multilateral resistance treatment the center of the account. A claim should name the carrier, the governing operation or relation, the applicable assumptions, and the recognition test. A bare label is insufficient because the name Home bias in trade puzzle can be used for a formal identity, an implementation, or a neighboring result unless carrier and convention are stated.
Manages Complexity¶
Without the abstraction, an analyst must reason directly over many local details: the carrier roles, admissibility assumptions, competing conventions, derived invariants, boundary cases, and proof or validation obligations specific to Home bias in trade puzzle. Home bias in trade puzzle compresses them into the roles in the structural signature. That compression permits comparison across instances without erasing the variables that determine validity. It also exposes which details may be varied safely and which are constitutive.
Abstract Reasoning¶
- Identify the carrier. State what the elements, states, objects, or observations are: bilateral trade flows, regions, national borders, distance, economic size, policy and cultural covariates and a gravity-model specification. Reject examples whose alleged carrier belongs to a different problem. 2. Lock the constitutive rule. Express domestic and cross-border flows are comparable and the home-bias estimate is conditional on a declared gravity model, geography, sector, period and multilateral resistance treatment independently of one notation or implementation.
Knowledge Transfer¶
Knowledge transfers strongly among subfields of international economics because they reuse bilateral trade flows, regions, national borders, distance, economic size, policy and cultural covariates and a gravity-model specification, Tariffs, regulation, currencies, information, networks, supply chains, language and model aggregation can make borders costly; estimation choices can inflate or reduce the residual border coefficient., and type the carrier, state every parameter and convention in the definition, test that domestic and cross-border flows are comparable and the home-bias estimate is conditional on a declared gravity model, geography, sector, period and multilateral resistance treatment, compare the nearest accepted identity, and report counterexamples, uncertainty, and limiting cases.
Relationships to Other Abstractions¶
Current abstraction Home bias in trade puzzle Domain-specific
Parents (1) — more general patterns this builds on
-
Home bias in trade puzzle is a kind of Baseline Deviation Prime
The proposed strict upward parent is
prime:baseline_deviation.
Hierarchy path (1) — routes to 1 parentless root
- Home bias in trade puzzle → Baseline Deviation → Comparison → Self Checking
Neighborhood in Abstraction Space¶
Home bias in trade puzzle sits in a moderately populated region (60th percentile for distinctiveness): it has near-neighbors but no dense thicket of look-alikes.
Family — Price Indices & Trade Anomalies (5 abstractions)
Nearest neighbors
- New trade theory — 0.89
- Lerner symmetry theorem — 0.88
- Trade-weighted effective exchange rate index — 0.87
- Immiserizing growth — 0.86
- Effective exchange rate index — 0.86
Computed from structural-signature embeddings · 2026-09-08