Proliferation of preferential trade agreements: an empirical analysis
Bibliographic record
Abstract
The creation of a preferential trade area (PTA) or the deepening of an existing one can affect adversely excluded countries and induce them to join or create a new PTA (Baldwin, 1993). One such adverse effect is trade diversion, the shift of imports from countries outside the preferential trade area toward member countries. This paper investigates empirically whether countries whose exports are more likely to suffer from trade diversion exhibit a higher likelihood of forming a PTA. I derive a measure of the potential of trade diversion from the trade complementarity index (Michaely (1962)) and estimate a dynamic Probit model of new PTAs formed between 1961 and 2005. The results show that countries facing a larger potential of trade diversion are more likely to form a PTA in the future. The results also support the natural trading partner hypothesis according to which preferential trade agreements are more likely to be formed among countries that are predisposed to trade a lot.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.006 | 0.035 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.003 | 0.006 |
| Science and technology studies | 0.001 | 0.002 |
| Scholarly communication | 0.003 | 0.003 |
| Open science | 0.002 | 0.002 |
| Research integrity | 0.001 | 0.003 |
| Insufficient payload (model declined to judge) | 0.017 | 0.002 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".