Accidental Market Makers

Autor
Matheus Britto
Co-autores
Fernando Chague
Resumo
Using comprehensive data from the Brazilian equity market (2017-2022), we document that retail investors act as unintentional liquidity providers on days of high adverse-selection risk --- accidental market makers. On such days, professional market makers withdraw while retail investors expand their passive limit-order volume, absorbing institutional demand precisely when it is most costly to supply. Retail investors fail to internalize the winner's curse embedded in passive order execution: day-zero returns on passive retail orders reach -59 basis points on buying days and -58 basis points on selling days, with no subsequent reversal, implying an annual wealth transfer of approximately USD 1.0 billion. A shift-share instrument based on regional flows into Brazil's government bond platform yields a 2SLS estimate of $0.97$ standard deviations improvement in market quality per one-percent increase in retail volume.
Palavras-chave
Retail Investors, Market Makers
Modalidade
Comunicação oral
Área Temática
Apreçamento de Ativos

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Referência

BRITTO, Matheus; CHAGUE, Fernando. Accidental Market Makers. In: XXVI Encontro Brasileiro de Finanças - Universidade de Fortaleza (Unifor)| Fortaleza, Ceará, 2026. Disponível em: <https://doity.com.br/anais/26ebfin/trabalho/516113>. Acesso em: 07/08/2026 às 00:32

Apreçamento de Ativos
Finanças Corporativas e Bancárias
Econometria Financeira
Engenharia Financeira
Macrofinanças
Econometria Financeira

Comissão Organizadora

Anderson Odias da Silva
Rafael Schiozer
Marcelo Fernandes

Comissão Científica

Alan De Genaro (FGV EAESP)
Allisson Martins (Universidade de Fortaleza)
Amanda Miranda Fantinatti (FEA-USP)
André de Castro Silva (Nova SBE)
Benjamin Miranda Tabak (FGV EPPGE)
Bernardo Ricca (Insper)
Bruno Cara Giovannetti (FGV EESP)
Caio Almeida (Princeton)
Claudia Yoshinaga (FGV EAESP)
Cristina Scherrer (LSE)
Danilo Cascaldi-Garcia (FED)
Eduardo Flores (FEA-USP)
Eduardo Horta (UFRGS)
Eduardo Kazuo Kayo (FEA-USP)
Emerson Fernandes Marçal (FGV EESP)
Fernando Chague (FGV EESP)
Flavio Augusto Ziegelmann (UFRGS)
Gustavo Freire (Nova SBE)
Gustavo Silva Araujo (BCB)
Henrique Castro (FGV EESP)
Henrique Castro Martins (FGV EAESP)
Jaime de Jesus Filho (FGV)
Jose Renato Haas Ornelas (BCB)
João F. Caldeira (UFSC)
Jéfferson Augusto Colombo (FGV EESP)
Klenio Barbosa (SKEMA)
Layla Mendes (FGV EBAPE)
Leandro dos Santos Maciel (FEA-USP)
Lucas Ayres Barreira de Campos Barros (FEA-USP)
Marcelo Brutti Righi (UFRGS)
Marcelo Fernandes (FGV EESP)
Marcelo Klötzle (PUC-Rio)
Mariana Oreng (ESPM)
Márcio Poletti Laurini (FEA-RP/USP)
Naielly Marques (PUC-Rio)
Paulo Renato Soares Terra (FGV EAESP)
Paulo Rogério Faustino de Matos (UFC)
Pedro A. C. Saffi (CUNEF)
Rafael Felipe Schiozer (FGV EAESP)
Rafael Matta (SKEMA)
Raquel de Freitas Oliveira (BCB)
Raul Riva (FGV EPGE)
Roberto Bomgiovani Cazzari (FEA-USP)
Rodrigo De Losso da Silveira Bueno (FEA-USP)
Rodrigo Leite (COPPEAD/UFRJ)
Ruy Monteiro Ribeiro (Insper)
Vinicius Augusto Brunassi Silva (FGV EESP)
Wilson Toshiro Nakamura (Mackenzie)
Yuri Fahham Saporito (FGV EMAp)