What would change this
What would change these conclusions
The paper is descriptive and identifies no causal effect. Global conditions, demographic change and technology could move both the institutional and the economic series. Below is the evidence that would weaken each finding. The paper sets out every case in full in section 9, section 6.10.2 and section 10.7.
Growth
The growth row is the one most sensitive to treatment. With each period's crisis year left out the two periods are level to within a tenth of a point. The national accounts were rebased in 2015 and again in 2026, and past revisions have been larger than the present gap, so a further revision could move this row either way.
Statistical suppression
The zero for every UPA year is the most contestable number in the study. A documented UPA-era event that meets the index's threshold would raise it, and the published code lets a critic recompute the index. A generous re-coding that gave the UPA decade an average of 2.0 would still leave 2.0 against 4.78.
Fiscal centralisation
On the four measured fiscal ratios alone the UPA years average 0.49 and the NDA years 0.45, so the NDA years are slightly less centralised. The higher NDA index comes from counting GST and the 2020 borrowing conditions as centralisation, and a reader who rejects that reading rejects this finding.
Democracy and press freedom
A demonstration that the movements in the V-Dem, Freedom House and RSF scores come from drift in the instruments would weaken the democracy result. It would also have to account for an independent synthetic-control study, Grier and Grier (2026), which finds the same direction by a different method.
Income and jobs
The income shares are World Inequality Lab estimates, which are revised from time to time, and no annual figure exists after 2022. The jobs finding rests on a direct survey measure. It would weaken if later labour force survey rounds showed regular-job coverage with social security back above its 2017-18 level of 11.5%.
Inflation
Inflation is the one measure that improved. A consistent core-inflation series, which leaves out food and fuel, showing a fall of comparable size would be strong evidence of something beyond the oil-price cycle. The paper does not carry such a series back to 2004 and has not run that test.