---
title: "The Effect of High-Tech Clusters on the Productivity of Top Inventors"
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[Enrico Moretti (2021)](https://doi.org/10.1257/aer.20191277). *American Economic Review*.

**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-71.json) · [QMD](aeraej-71.qmd) · [Reproduction code](collection-code.zip)

## Source design and template applicability

The main cluster-productivity application combines continuous cluster-density exposure and IV. Secondary Rochester/Kodak binary-shock specifications do not replace that mixed design under the current rule; their analysis data are also unavailable.

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

**Preparation blocked.**

The cluster-size exposure is generated by the COMETS/APAT patent/inventor pipeline; data_3.dta and data_patent_level_3.dta are absent.

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:** rebuild_required; verification: public data absent; 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.

- `AER/Moretti_AER_2021_140662/R/01_replicate_empirical_results.R` (265 lines)
- `AER/Moretti_AER_2021_140662/aeraej-71.md` (194 lines)