# PAPER_REVIEW — Critical assessment before the scholarly upgrade

Assessment of paper/ (UQO WP5, 43-page build of 2026-08-05) and of the analysis code in scripts//src/, written before the literature expansion. Results, data, and figures are out of scope: only framing, positioning, and scholarship are assessed.

# 1. Core contribution — stated, but under-positioned

The paper claims three contributions (intro, ¶6): (i) first granular listing-level analysis of the Airbnb–rent nexus in Quebec; (ii) a multi-method design (hedonic OLS, SAR/SEM, quantile, ML) on a single dataset; (iii) policy relevance for Canadian short-term-rental (STR) regulation. These are credible but under-argued:

• The "first for Quebec" claim is asserted without engaging the Canadian STR literature at all — notably the McGill group's work on STRs in Canadian cities (Wachsmuth and coauthors), which quantified Montreal's STR market and housing-loss estimates. Without citing it, contribution (i) is exposed.
• The multi-method point is defensible but currently reads as a list; it should be framed against the identification hierarchy of the field (IV, quasi-experiments, panels) — i.e., what a careful cross-sectional multi-method study adds given that stronger designs exist elsewhere.
• The buffer-based exposure construction (exact Haversine counts at 250 m–2 km around each rental listing) is arguably the paper's most distinctive methodological feature and deserves to be foregrounded as such.

# 2. Literature review — thin and dated for a 2026 paper

The current §2 has ~24 references and six one-paragraph subsections. Major gaps:

1. Quasi-experimental Airbnb–housing studies are absent. The review stops at Barron et al., Horn & Merante, Garcia-López et al., Sheppard & Udell. Missing: Los Angeles ordinance evidence (Koster–van Ommeren–Volkhausen), New Orleans regulation (Valentin), Berlin (Duso et al.), Portugal (Franco & Santos), France (Ayouba et al.), London (Shabrina et al.), Amsterdam/hotel margins, and the NYC distributional analysis (Calder-Wang). These are the papers a referee will name first.
2. No Canadian evidence. Combs–Kerrigan–Wachsmuth (national STR analysis), Wachsmuth–Weisler is cited but only for the rent-gap concept, and the Toronto displacement work (Grisdale) is absent. For a Quebec paper this is the single most damaging gap.
3. Sharing-economy economics (peer-to-peer market design and welfare): Zervas et al. (hotel displacement), Farronato & Fradkin (welfare effects), Einav–Farronato–Levin (P2P markets), Sundararajan (book) — none cited. These ground the supply-diversion mechanism the paper leans on.
4. Airbnb pricing hedonics (Model 2 has no dedicated literature): Wang & Nicolau, Gibbs et al., Ert et al. on trust/reputation — the superhost discount found in Table 4 cannot be discussed against prior findings without them.
5. Hedonic methodology: only Rosen + two survey chapters. Missing Lancaster (characteristics demand), Sirmans et al. (empirical composition survey), Kuminoff–Parmeter–Pope (specification reliability), Malpezzi (applied review).
6. Spatial econometrics: Anselin and LeSage & Pace are cited, but the actual estimators used (GM_Lag / GM_Error) descend from Kelejian & Prucha (1998, 1999) — currently uncited, which is a methods-citation hole. Housing applications (Can; Dubin) also absent.
7. Quantile regression: only Koenker–Bassett + Zietz et al. Missing the canonical applied reference (Koenker & Hallock) and housing-distribution work (McMillen).
8. ML methods: Zou & Hastie (elastic net) uncited although the method is used; scikit-learn (Pedregosa et al.) uncited although it produced every ML number.
9. Tourism gentrification: Wachsmuth–Weisler is there, but the strand's antecedents (Gotham's "tourism gentrification"; Cocola-Gant; Gurran & Phibbs on planning responses) are absent, leaving §7's policy discussion free-floating.

# 3. Weak or unsupported argumentation

• Intro ¶3 (Quebec context): "over 11 million visitors annually", "vacancy rates … historically low levels" — plausible but uncited; either cite a source that can be verified or soften to qualitative statements. Flagged for the author rather than silently sourced.
• §5.2 superhost discount: the composition-effect interpretation is offered without any literature on reputation pricing (Ert et al.; Gibbs et al. find superhost premia — a disagreement worth stating).
• §6.5 ring decomposition is honest but isolated; connecting it to the spatial-decay findings in Garcia-López et al. and Koster et al. would turn a caveat into a comparison.
• Discussion interprets magnitudes only against the paper's own numbers; no comparison of the 0.4%-per-listing semi-elasticity with Barron et al.'s elasticity, Horn & Merante's 0.4% per one-SD, Koster et al.'s ~2% price/rent drops from bans, Franco & Santos, or Ayouba et al. The single most useful addition a reader could ask for.
• Limitations are listed (6 items) but not developed: no discussion of measurement error in scraped exposure (platform coverage), MAUP/buffer-choice issues, or asking-vs-contract rent literature.

# 4. Underdeveloped sections (length audit)

# 5. Positioning: current vs. target

Currently reads as: a competent regional case study with a methods buffet. Should read as: the first listing-level, multi-method quantification of the Airbnb–rent association for Quebec — a market with distinctive regulation (CITQ registration, Bill 25) and Canada's second-largest STR market — explicitly placed between the correlational early literature and the quasi-experimental strand, with transparent identification limits and magnitudes benchmarked against both.

# 6. Upgrade plan (executed in Phases 2–3)

1. Verify and add ~25–30 references (OpenAlex-verified metadata, DOIs) → target ≈ 50–55 total.
2. Restructure §2 into thematic subsections: (a) STR platforms & housing costs — correlational to quasi-experimental; (b) Canadian & Quebec evidence; (c) sharing-economy market effects; (d) STR pricing hedonics; (e) hedonic theory & practice; (f) spatial econometrics; (g) distributional/quantile; (h) ML in housing; (i) tourism gentrification & regulation.
3. Introduction: +3 paragraphs (positioning, Canadian gap, magnitude preview).
4. Methods: ground every estimator with its source.
5. Discussion: add "Findings in context of the literature" subsection with a magnitude-comparison narrative; expand limitations (measurement error, MAUP, asking rents) and future work.
6. Length target: ≈ +30 % prose (43 → ~55 pages).

# 7. Items the author must verify (not resolved by me)

• The uncited factual claims in intro ¶3 (visitor counts, vacancy rates).
• Whether "first granular listing-level analysis for Quebec" survives the McGill-group literature now cited (I have worded the claim more precisely: first listing-level hedonic/econometric study for Quebec, distinguishing it from the McGill descriptive/market-measurement work).
• The regulatory description of CITQ registration and Montreal borough rules (§7.2) is uncited; verify against current provincial law (Bill 25, 2023).