---
title: "The Effects of Import Competition on Unionization"
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[John S. Ahlquist; Mitch Downey (2023)](https://doi.org/10.1257/pol.20200709). *American Economic Journal: Economic Policy*.

**Under development — community extension.** This is a provisional source-design assessment, not a new successful replication or a final eligibility ruling.

[Extension index](development.html) · [Provisional eligibility log](development.html#eligibility-log) · [Assessment JSON](aeraej-132.json) · [QMD](aeraej-132.qmd) · [Reproduction code](collection-code.zip)

## Source design and template applicability

nexposure is standardized industry import-competition exposure in the unionization regression. Its continuous variation is retained conceptually, not recoded into treated/untreated industries.

No DiD estimates, uncertainty intervals or homogeneity-test decision were computed in this tranche. No point is added to the calibration plots. This is not a zero effect or a failed statistical test.

## Recorded treatment-column measurement

**64 distinct nonmissing values** in `nexposure`.

Observed support in the indicated source frame; missing values excluded. N=64; missing=0. Frame: selected_source_data. Source: /Volumes/LAL_BAK/did-cardinality-work/packages/Ahlquist_Downey_AEJ-Policy_2023_176801/Data-Created/dsA_wide.dta.

These are the existing data-measured counts, not counts inferred from design labels. A binary instrument, group indicator or interaction component need not be the treatment of interest; the source-design assessment above takes precedence for template applicability.

## Replication status

**This tranche:** unsupported design; source code/documentation inspected, no estimator run.

**Supplied library:** verified; verification: verified; preparation: runs_with_shim. These are the library’s labels, not new verification claims. Missing data and unsupported designs are separate issues.

## Evidence and provenance

The following files in the supplied library were inspected. Their SHA-256 digests are recorded in the downloadable assessment JSON. Source archives and microdata are not redistributed.

- `AEJ-Policy/Ahlquist_Downey_AEJ-Policy_2023_176801/R/132_ahlquist_downey_replicate.R` (137 lines)
- `AEJ-Policy/Ahlquist_Downey_AEJ-Policy_2023_176801/verdict.md` (57 lines)
- `AEJ-Policy/Ahlquist_Downey_AEJ-Policy_2023_176801/aeraej-132.md` (281 lines)