--- title: "A Signal to End Child Marriage: Buchmann, Field, Glennerster, Nazneen & Wang (2023)" description: >- Distilled: A clustered RCT in rural Bangladesh showed a small conditional financial incentive (cooking oil, ~US$16/year) for adolescent girls to remain unmarried reduced underage marriage by 19 percent and increased schooling, while a traditional empowerment program had no marriage effect and raised dowry. A signaling model explains child marriage persistence as a pooling equilibrium driven by information asymmetry about bride type. American Economic Review 2023, free after 12-month AEA embargo. Seven core results with source locators, the signaling model, and the empirical specifications. sidebar: label: Buchmann et al. 2023 order: 1 tags: [paper-summary, development-economics, gender, child-marriage, marriage-markets, field-experiment, signaling, open-access, peer-reviewed, unreplicated, data:dhs] paper: authors: Nina Buchmann, Erica Field, Rachel Glennerster, Shahana Nazneen, Xiao Yu Wang authorList: - { family: Buchmann, given: Nina, affiliation: Stanford University } - { family: Field, given: Erica, affiliation: Duke University } - { family: Glennerster, given: Rachel, orcid: "0000-0002-9345-4858", affiliation: University of Chicago } - { family: Nazneen, given: Shahana, affiliation: Bangladesh } - { family: Wang, given: Xiao Yu, orcid: "0000-0002-6800-1275", affiliation: "Duke University / CRI Foundation" } year: 2023 venue: "American Economic Review 113(10), October 2023, 2645-2688" venueShort: AER 2023 doi: 10.1257/aer.20220720 jel: codes: [J12, J16, C93] assignedBy: claude-sonnet-4-6 date: 2026-06-25 topics: ["Poverty, Education, and Child Welfare", "Demographic Trends and Gender Preferences", "Global Maternal and Child Health"] dataAccess: hand-collected outcome: - probability of underage marriage (below age 18) - age at first marriage - school enrollment and years of schooling completed - dowry amount paid at marriage outcomeClass: [social-welfare, labor-careers-health] license: "free access after 12-month AEA embargo; NIH Public Access copy on PMC (https://pmc.ncbi.nlm.nih.gov/articles/PMC12734939/); no CC license found in Crossref metadata (checked 2026-06-25)" licenseShort: "AEA 12-month embargo (no CC)" access: open machineAccess: "AEA landing page accessible; full text via NIH PMC (https://pmc.ncbi.nlm.nih.gov/articles/PMC12734939/); AEA embargo expired Oct 2024 (checked 2026-06-25)" redistribution: extract-only resultsCount: 7 citedByCount: 35 methods: role: both family: reduced-form-causal buildsFrom: [panel-regression, signaling-game-pbe] identification: randomized contributionType: [new-theory, new-fact, new-data] mechanisms: [information-asymmetry] introducesData: true scope: region: Bangladesh period: 2007-01..2017-09 frequency: mixed dataType: [survey, experimental, administrative] granularity: [individual] n: "15,576 women in parents' survey (age 15-17 at program start); 1,755 in young women's survey" findings: - ref: R1 outcome: probability of underage marriage (below age 18) metric: pp-effect value: "-7.4 ppts (SE 0.019, p<0.01) for girls age 15 eligible 2 years; -4.9 ppts (SE 0.010, p<0.01) for full sample age 15-17" direction: negative vsBenchmark: "control means 38.5% (age 15) and 29.3% (age 15-17)" - ref: R2 outcome: age at first marriage metric: coefficient value: "+0.32 years (3.9 months, p<0.01) for age 15; +0.21 years (2.5 months, p<0.01) for age 15-17" direction: positive - ref: R3 outcome: school enrollment and years of schooling completed metric: pp-effect value: "+8.6 ppts in school at midline (p<0.01) for age 15; +5.0 ppts in school at endline for age 15" direction: positive vsBenchmark: "control means 48.2% in school at midline and 27.8% at endline for the age-15 cohort" - ref: R4 outcome: dowry amount paid at marriage metric: coefficient value: "US$17.6 (SE 24.3, not significant) incentive effect on dowry; husband education -0.166 (SE 0.119, not significant)" direction: none vsBenchmark: "control mean US$888 dowry; null confirms no marriage-market penalty for incentive recipients" - ref: R5 outcome: dowry amount paid at marriage metric: coefficient value: "US$57.3 (SE 20.7, p<0.01) empowerment effect on dowry; null effect on marriage timing in main parents' sample" direction: positive vsBenchmark: "6% above control mean of US$888; no offsetting change in husband quality or denmeher" - ref: R6 outcome: probability of underage marriage (below age 18) metric: pp-effect value: "-2.9 ppts (SE 1.6, p<0.10) for untreated age 15-17 within 500m of incentive village; placebo age 7-14: -0.9 ppts (SE 1.5, not significant)" direction: negative vsBenchmark: "control mean 28.8% in non-incentive communities; placebo null rules out attitude-change spillovers" - ref: R7 outcome: probability of underage marriage (below age 18) metric: pp-effect value: "Low social conservatism (nonpreferred type): -14.7 ppts (SE 5.9, p<0.05); high social conservatism (preferred type): +9.3 ppts (SE 8.0, not significant)" direction: mixed vsBenchmark: "control means 36.0% (low SC) and 47.9% (high SC); type-specific pattern confirms signaling channel" resultType: new-finding relatesTo: - { cite: "Wahhaj (2018)", doi: '10.1016/j.jebo.2018.06.001', relation: builds-on, note: "closest theoretical antecedent; both models show early marriage persists as signaling equilibrium without preference for young brides; key differences in mechanism (differential returns to education by type) and policy predictions" } - { cite: "Field and Ambrus (2008)", doi: '10.1086/593333', relation: cites, note: "documents causal negative effect of early marriage on female schooling in Bangladesh; motivates the education channel in the signaling model" } - { cite: "Duflo, Dupas, and Kremer (2015)", doi: '10.1257/aer.20121607', relation: cites, note: "evidence that transfers conditional on school attendance delay marriage in contexts without dowry; this paper conditions on marriage age alone in a dowry context" } - { cite: "Baird, McIntosh, and Ozler (2011)", doi: '10.1093/qje/qjr032', relation: cites, note: "cash-transfer evidence from Malawi cited as a context where conditional transfers did not reduce marriage" } openQuestions: - "Scalability depends on feasibility of monitoring marriage status at larger scale; rising digitization of identification may reduce monitoring costs over time (p. 2679)." - "ITT estimates exclude general-equilibrium effects on untreated girls; full impact depends on comprehensiveness of program coverage (p. 2679)." - "Long-run adult outcomes beyond marriage and schooling (labor force participation, bargaining power, children's outcomes) are not observed in the 2017 endline and are the subject of a planned third data collection wave (p. 2659)." replicationCode: url: "https://doi.org/10.3886/E192114V1" status: available extraction: - by: paper-distiller (claude-sonnet-4-6) date: 2026-06-25 role: extracted note: "Full PDF read (pp. 2645-2688); seven core results extracted with table and page locators. Not human-verified. Not reproduced." - by: paper-verifier (claude-sonnet-4-6) date: 2026-06-24 role: verified note: "Locators and reported magnitudes re-checked against the source PDF; R3 midline control mean corrected from 46.6% to 48.2% (age-15 cohort, Table 3 col 2); colorful adjective removed from TL;DR; all equations and specifications verified term-by-term; six other rows passed without change." licenceVerification: - source: Crossref REST API works/10.1257/aer.20220720 checked: 2026-06-25 by: paper-distiller (claude-sonnet-4-6) found: "No license[] block in Crossref metadata; published 2023-10-01; container-title American Economic Review. OpenAlex reports NIH PMC open-access copy at https://pmc.ncbi.nlm.nih.gov/articles/PMC12734939/" rightsSignalConflict: false --- **What this is.** Core results, the signaling model of marriage timing, and the main empirical specifications from a 44-page paper: enough to know what it found and how, without reading the full source. To replicate or extend, read the original at the [DOI](https://doi.org/10.1257/aer.20220720). ## TL;DR The paper runs a clustered RCT in rural Bangladesh (2007-2017) testing two policy approaches to child marriage: (i) a conditional financial incentive (cooking oil, approximately US$16/year) paid to families while their adolescent daughters remain unmarried, and (ii) a standard adolescent empowerment program (Kishore Kontha). The incentive is effective at reducing child marriage: girls eligible for two years are 19 percent less likely to marry underage and complete significantly more schooling, with no marriage-market penalty (dowry and husband quality are unchanged). The empowerment program fails to reduce marriage and raises dowry, consistent with a perverse signaling effect. The paper then develops a signaling model in which early marriage signals socially conservative bride type (valued by grooms), and supports this mechanism via spillovers: untreated less-conservative women near incentive communities also delay marriage, while conservative women do not. ## Core results Magnitudes as reported; \*\*\* = 1%, \*\* = 5%, \* = 10%. ITT estimates from OLS with Huber-White SEs clustered at the community level and union fixed effects (Tables 2-4). Table 5 uses a proximity-based spillover design within non-incentive communities. | # | Result | Locator | Magnitude | |---|---|---|---| | R1 | Incentive reduces underage marriage (< 18) | Table 2, col 2, p. 2661 | -7.4 ppts\*\*\* (age 15, 19% reduction); -4.9 ppts\*\*\* (age 15-17, 17%); control means 38.5% and 29.3% | | R2 | Incentive increases average age at marriage | Table 2, cols 6-7, p. 2661 | +0.32 years\*\*\* (3.9 months) for age 15; +0.21 years\*\*\* (2.5 months) for age 15-17 | | R3 | Incentive increases school enrollment and attainment | Table 3, cols 2-4, p. 2664 | +8.6 ppts\*\*\* in school at midline for age 15; +5.0 ppts at endline; control means 48.2% (midline) and 27.8% (endline) for age-15 cohort | | R4 | No marriage-market penalty from incentive (null result) | Table 4, col 1, p. 2666 | Dowry: US$17.6 (SE 24.3, not sig.); husband education: -0.166 (SE 0.119, not sig.); control mean US$888 | | R5 | Empowerment raises dowry with no marriage improvement | Table 4, col 1; Table 2, col 1, p. 2666, 2661 | Dowry +US$57.3\*\*\* (6% above control); marriage rate coefficient -0.007 (SE 0.008, not sig.) | | R6 | Spillovers on untreated nearby women; null for ineligible ages | Table 5, cols 1-2, p. 2678 | Age 15-17 within 500m: -2.9 ppts\* married <18; placebo age 7-14: -0.9 ppts (not sig.) | | R7 | Spillovers are specific to less socially conservative (nonpreferred-type) women | Table 5, cols 3-4, p. 2678 | Low SC: -14.7 ppts\*\* married <18; high SC: +9.3 ppts (not sig.); control means 36.0% and 47.9% | **Overall (paper's conclusion).** The pattern is inconsistent with child marriage reflecting strong cultural preferences for young brides or unraveling in a thin marriage market. A signaling model in which early marriage signals socially conservative (preferred) bride type explains why: a small financial incentive orthogonal to type can shift the equilibrium from universal early marriage to later marriage for all women who can credibly claim eligibility. The empowerment program's failure, and its associated dowry increase, is also predicted by the model: making more women appear nonpreferred strengthens the incentive for conservative women to signal type by marrying early. ## Theory / model The model is a two-period marriage-market signaling game (Section IV, pp. 2666-2675). Women have measure $$|W| = 1$$ and men measure $$|M| > 1$$. Women are heterogeneous in an unobservable type $$\Theta \in \{\Theta_H, \Theta_L\}$$, where $$\Theta_H$$ (preferred, socially conservative) has population fraction $$f \in (0,1)$$ and is privately known. Men are homogeneous and desire $$\Theta_H$$ women. If a woman marries in period $$t_1$$ she has education $$E_L$$; if she delays to $$t_2$$ her education rises to $$E_H > E_L$$. The total transferable utility of a union between a man and woman of type $$\Theta_j$$ and education $$E_j$$ is $$\mu(\Theta_j, E_j)$$, increasing in both arguments. Two conditions govern equilibrium (p. 2669): **(i) Preferred type is first-order in desirability:** $$ \mu(\Theta_H, E_H) \;>\; \mu(\Theta_H, E_L) \;>\; \mu(\Theta_L, E_H) \;>\; \mu(\Theta_L, E_L) \tag{1} $$ **(ii) Single-crossing, type and education are substitutes:** $$ \mu(\Theta_H, E_H) - \mu(\Theta_H, E_L) \;<\; \mu(\Theta_H, E_L) - \mu(\Theta_L, E_H) \;<\; \mu(\Theta_L, E_H) - \mu(\Theta_L, E_L) \tag{2} $$ Condition (2) implies preferred types gain less from delayed marriage (higher education) than nonpreferred types. Dowry $$D$$ can be conditioned only on observable characteristics (marriage timing, education); men compete for available women and receive their outside options in equilibrium. **Result 1** (p. 2671, Appendix A): Under a liquidity constraint $$Y < \omega_M + \mu(\Theta_H, E_H) - 2\mu(\Theta_H, E_L)$$, no separating equilibrium exists: nonpreferred types cannot afford the dowry $$D|t_2$$ that would credibly signal preferred type. **Result 2** (p. 2672, Appendix C): When separation is infeasible, the unique PBE surviving the Cho-Kreps intuitive criterion is pooling on $$t_1$$ (all women marry early). Equilibrium dowries are: $$ D|t_1 = \omega_M - \bigl[f\,\mu(\Theta_H, E_L) + (1-f)\,\mu(\Theta_L, E_L)\bigr], \qquad D|t_2 = \omega_M - \mu(\Theta_L, E_H) $$ Pooling on $$t_2$$ fails the intuitive criterion because preferred types would profitably deviate to $$t_1$$ (where grooms know with certainty that early entrants are preferred type). Pooling on $$t_1$$ survives because neither type can credibly signal itself by deviating to $$t_2$$. This is the child-marriage equilibrium of Wahhaj (2018) but generated here by differential returns to education rather than preference for young brides. **Corollary 2** (p. 2675): A decrease in $$f$$ (more nonpreferred types) makes pooling more likely. This is the mechanism by which the empowerment program can worsen early marriage: by reducing the perceived fraction of preferred types, it strengthens the signaling incentive for conservative women. **Result 4** (pp. 2673-2674): If a conditional incentive $$C$$ satisfying $$ C \;>\; \mu(\Theta_H, E_L) - \bar{\mu}(E_H) - \bigl[\mu(\Theta_H, E_H) - \mu(\Theta_H, E_L)\bigr] $$ is offered randomly to fraction $$\tau$$ of women (treatment orthogonal to type), a semiseparating PBE exists and Pareto-dominates the pooling equilibrium. Untreated preferred types marry at $$t_1$$; all other women delay to $$t_2$$. Equilibrium dowries under the incentive: $$ D|t_1 = \omega_M - \mu(\Theta_H, E_L), \qquad D|t_2 = \omega_M - \bar{\mu}(E_H) $$ where $$\bar{\mu}(E_H) \equiv \frac{\tau f\,\mu(\Theta_H, E_H) + (1-\tau)(1-f)\,\mu(\Theta_L, E_H)}{\tau f + (1-\tau)(1-f)}$$ is the expected match quality when the fraction of preferred types among $$t_2$$ entrants is $$f' < f$$. Crucially, untreated nonpreferred types also delay (the **spillover**): because treatment status is unobservable, delaying marriage is no longer a certain signal of being the nonpreferred type (Prediction 4, p. 2676). ## Method **Experimental design.** A clustered randomized trial in 460 communities across five subdistricts in rural Bangladesh, randomized in ratio 1:2:1:2 to (i) incentive only, (ii) empowerment only, (iii) both, (iv) control. Randomization was stratified by union (administrative grouping of approximately 10 communities) and community size. All girls aged 15-17 and unmarried at program start (January 2008) were eligible for the conditional incentive; 92 percent received it at least once. The empowerment program (Kishore Kontha) reached 93 percent of eligible girls. The incentive program was implemented January 2008 to August 2010. Main outcome data come from an endline survey conducted 2016-2017, approximately 4.5 years after program completion. **Estimation.** ITT effects are estimated via OLS linear probability models (`panel-regression`) with Huber-White robust standard errors clustered at the community level (the unit of randomization). The theoretical mechanism is formalized in the `signaling-game-pbe` model (Results 1-4 above). Field and Ambrus (2008) establish the education channel in Bangladesh; Duflo, Dupas, and Kremer (2015) and Baird, McIntosh, and Ozler (2011) provide comparable evidence from transfer programs in other contexts. ## Empirical specifications **Main ITT regression** (Equation 1, p. 2659): $$ Y_{icu} = \alpha + \beta_1 I_c + \beta_2 E_c + \beta_3 (I_c \times E_c) + \beta_4' \mathbf{X}_{ic} + \varepsilon_{icu} \tag{3} $$ where $$Y_{icu}$$ is outcome for person $$i$$ in community $$c$$ and union $$u$$; $$I_c$$ = assignment to the incentive program; $$E_c$$ = assignment to the empowerment program; $$\mathbf{X}_{ic}$$ includes village population tercile and union fixed effects, age indicators, household size, older unmarried sister in household, school enrollment, mother's education, and public transport access (a proxy for remoteness). The interaction $$I_c \times E_c$$ tests complementarity. Tables 2, 3, and 4 report $$\hat{\beta}_1$$, $$\hat{\beta}_2$$, $$\hat{\beta}_3$$. The main analysis sample covers 15,576 women in the parents' survey. **Spillover specification** (Table 5, p. 2678): Estimated on nonincentive communities only, comparing women within 500 meters of an incentive community center to women farther away: $$ Y_{icu} = \alpha + \gamma \cdot \text{Close}_c + \delta' \mathbf{W}_{ic} + \varepsilon_{icu} \tag{4} $$ where $$\text{Close}_c = 1$$ if the community center is within 500 meters of the closest incentive community center. $$\mathbf{W}_{ic}$$ includes union fixed effects, baseline characteristics, and distances to the closest community center and safe space (to rule out urbanicity confounds). Placebo test: same regression for girls aged 7-14 who are observably ineligible. Type heterogeneity: equation (4) is estimated separately for girls with above-median and below-median social conservatism index (columns 3-4 of Table 5), testing Prediction 4 of the signaling model. ## Datasets used | Dataset | Role in paper | Wiki page | |---|---|---| | Authors' RCT survey data (parents' and young women's surveys) | Main analysis: marriage outcomes, schooling, dowry, husband characteristics; 460 communities, 24,095 girls at baseline, 15,576 in endline parents' sample | No page yet (hand-collected; replication data at https://doi.org/10.3886/E192114V1) | | Bangladesh Demographic and Health Surveys (DHS, waves 2004-2017) | Descriptive context: trends in marriage age, education, and child mortality 2004-2017 (Figure 1, p. 2646) | No page yet | Sample scope: rural Bangladesh, five subdistricts (Daulatkhan, Babuganj, Muladi, Patuakhali Sadar, Bauphal, Bhola Sadar). Program period January 2007 to September 2017. Main endline wave: 2016-2017. ## When to read the full paper Read the [original](https://doi.org/10.1257/aer.20220720) if you are: (i) extending the signaling model to other cultural contexts with bride-type heterogeneity or dowry; (ii) designing a conditional transfer program for child marriage reduction; (iii) examining the cost-effectiveness calculation of US$1,010 NPV per US$1,000 invested (Buchmann et al. 2021 companion paper); or (iv) testing Predictions 1-4 of the signaling model in a new setting. Tables 2, 3, and 5 contain the core empirical results; Section IV formalizes the model; Appendix A carries the proofs. ## Attribution and rights Source: peer-reviewed, *American Economic Review* 113(10), October 2023. This distillation was extracted by an LLM on 2026-06-25 and is **not human-verified or independently reproduced**. The article is freely accessible after the AEA 12-month embargo (expired October 2024) and via NIH PMC; no CC license applies, so redistribution is extract-only. > Buchmann, Nina, Erica Field, Rachel Glennerster, Shahana Nazneen, and Xiao Yu Wang. > "A Signal to End Child Marriage: Theory and Experimental Evidence from Bangladesh." > *American Economic Review* 113, no. 10 (October 2023): 2645-2688. > DOI: 10.1257/aer.20220720.