Documents disponibles écrits par cet auteur

Combinatorial auctions for procurement / Marcelo Olivares in Management science, Vol. 58 N° 8 (Août 2012) 

Public ISBD [article]  in Management science > Vol. 58 N° 8 (Août 2012) . - pp.1458-1481 Titre : Combinatorial auctions for procurement : An empirical study of the chilean school meals auction Type de document : texte imprimé Auteurs : Marcelo Olivares, Auteur ; Gabriel Y. Weintraub, Auteur ; Rafael Epstein, Auteur Année de publication : 2012 Article en page(s) : pp.1458-1481 Note générale : Management Langues : Anglais (eng) Mots-clés : Combinatorial  auctions  Procurement  Auction  design  Empirical  Public  sector  applications Résumé : In this paper we conduct an empirical investigation of a large-scale combinatorial auction (CA)—the Chilean auction for school meals in which the government procures half a billion dollars worth of meal services every year. Our empirical study is motivated by two fundamental aspects in the design of CAs: (1) which packages should bidders be allowed to bid on and (2) diversifying the supplier base to promote competition. We use bidding data to uncover important aspects of the firms' cost structure and their strategic behavior, both of which are not directly observed by the auctioneer; these estimates inform the auction design. Our results indicate that package bidding that allows firms to express their cost synergies due to economies of scale and density seems appropriate. However, we also found evidence that firms can take advantage of this flexibility by discounting package bids for strategic reasons and not driven by cost synergies. Because this behavior can lead to inefficiencies, it may be worth evaluating whether to prohibit certain specific combinations in the bidding process. Our results also suggest that market share restrictions and running sequential auctions seem to promote competition in the long run, without significantly increasing the short-run cost for the government due to unrealized cost synergies. Our results highlight that the simultaneous consideration of the firms' operational cost structure and their strategic behavior is key to the successful design of a CA. More broadly, our paper is the first to provide an econometric study of a large-scale CA, providing novel and substantive insights regarding bidding behavior in this type of auction. ISSN : 0025-1909 En ligne : http://mansci.journal.informs.org/content/early/2012/04/13/mnsc.1110.1496.abstra [...] [article] Combinatorial auctions for procurement : An empirical study of the chilean school meals auction [texte imprimé] / Marcelo Olivares, Auteur ; Gabriel Y. Weintraub, Auteur ; Rafael Epstein, Auteur . - 2012 . - pp.1458-1481. Management Langues : Anglais (eng) in Management science > Vol. 58 N° 8 (Août 2012) . - pp.1458-1481 Mots-clés : Combinatorial  auctions  Procurement  Auction  design  Empirical  Public  sector  applications Résumé : In this paper we conduct an empirical investigation of a large-scale combinatorial auction (CA)—the Chilean auction for school meals in which the government procures half a billion dollars worth of meal services every year. Our empirical study is motivated by two fundamental aspects in the design of CAs: (1) which packages should bidders be allowed to bid on and (2) diversifying the supplier base to promote competition. We use bidding data to uncover important aspects of the firms' cost structure and their strategic behavior, both of which are not directly observed by the auctioneer; these estimates inform the auction design. Our results indicate that package bidding that allows firms to express their cost synergies due to economies of scale and density seems appropriate. However, we also found evidence that firms can take advantage of this flexibility by discounting package bids for strategic reasons and not driven by cost synergies. Because this behavior can lead to inefficiencies, it may be worth evaluating whether to prohibit certain specific combinations in the bidding process. Our results also suggest that market share restrictions and running sequential auctions seem to promote competition in the long run, without significantly increasing the short-run cost for the government due to unrealized cost synergies. Our results highlight that the simultaneous consideration of the firms' operational cost structure and their strategic behavior is key to the successful design of a CA. More broadly, our paper is the first to provide an econometric study of a large-scale CA, providing novel and substantive insights regarding bidding behavior in this type of auction. ISSN : 0025-1909 En ligne : http://mansci.journal.informs.org/content/early/2012/04/13/mnsc.1110.1496.abstra [...]

Drivers of finished-goods inventory in the U.S. automobile industry / Gérard P. Cachon in Management science, Vol. 56 N° 1 (Janvier 2010) 

Public ISBD [article]  in Management science > Vol. 56 N° 1 (Janvier 2010) . - pp. 202-216 Titre : Drivers of finished-goods inventory in the U.S. automobile industry Type de document : texte imprimé Auteurs : Gérard P. Cachon, Auteur ; Marcelo Olivares, Auteur Année de publication : 2010 Article en page(s) : pp. 202-216 Note générale : Management Langues : Anglais (eng) Mots-clés : Empirical  Supply  chain  management  Distribution  Product  variety  Inventory  theory  Manufacturing  flexibility Index. décimale : 658 Organisation des entreprises. Techniques du commerce Résumé : Automobile manufacturers in the U.S. supply chain exhibit significant differences in their days of supply of finished vehicles (average inventory divided by average daily sales rate). For example, from 1995 to 2004, Toyota consistently carried approximately 30 fewer days of supply than General Motors. This suggests that Toyota's well-documented advantage in manufacturing efficiency, product design, and upstream supply chain management extends to their finished-goods inventory in their downstream supply chain from their assembly plants to their dealerships. Our objective in this research is to measure for this industry the effect of several factors on inventory holdings. We find that two factors, the number of dealerships in a manufacturer's distribution network and a manufacturer's production flexibility, explain essentially all of the difference in finished-goods inventory between Toyota and three other manufacturers: Chrysler, Ford, and General Motors. DEWEY : 658 ISSN : 0025-1909 En ligne : http://mansci.journal.informs.org/content/56/1.toc [article] Drivers of finished-goods inventory in the U.S. automobile industry [texte imprimé] / Gérard P. Cachon, Auteur ; Marcelo Olivares, Auteur . - 2010 . - pp. 202-216. Management Langues : Anglais (eng) in Management science > Vol. 56 N° 1 (Janvier 2010) . - pp. 202-216 Mots-clés : Empirical  Supply  chain  management  Distribution  Product  variety  Inventory  theory  Manufacturing  flexibility Index. décimale : 658 Organisation des entreprises. Techniques du commerce Résumé : Automobile manufacturers in the U.S. supply chain exhibit significant differences in their days of supply of finished vehicles (average inventory divided by average daily sales rate). For example, from 1995 to 2004, Toyota consistently carried approximately 30 fewer days of supply than General Motors. This suggests that Toyota's well-documented advantage in manufacturing efficiency, product design, and upstream supply chain management extends to their finished-goods inventory in their downstream supply chain from their assembly plants to their dealerships. Our objective in this research is to measure for this industry the effect of several factors on inventory holdings. We find that two factors, the number of dealerships in a manufacturer's distribution network and a manufacturer's production flexibility, explain essentially all of the difference in finished-goods inventory between Toyota and three other manufacturers: Chrysler, Ford, and General Motors. DEWEY : 658 ISSN : 0025-1909 En ligne : http://mansci.journal.informs.org/content/56/1.toc

Structural estimation of the effect of out-of-stocks / Andrés Musalem in Management science, Vol. 56 N° 7 (Juillet 2010) 

Public ISBD [article]  in Management science > Vol. 56 N° 7 (Juillet 2010) . - pp. 1180-1197 Titre : Structural estimation of the effect of out-of-stocks Type de document : texte imprimé Auteurs : Andrés Musalem, Auteur ; Marcelo Olivares, Auteur ; Eric T. Bradlow, Auteur Année de publication : 2010 Article en page(s) : pp. 1180-1197 Note générale : Management Langues : Anglais (eng) Mots-clés : Aggregate  demand  estimation  Bayesian  methods  Choice  models  Data  augmentation  Inventory  management  Out-of-stocks  Retailing Index. décimale : 658 Organisation des entreprises. Techniques du commerce Résumé : We develop a structural demand model that endogenously captures the effect of out-of-stocks on customer choice by simulating a time-varying set of available alternatives. Our estimation method uses store-level data on sales and partial information on product availability. Our model allows for flexible substitution patterns, which are based on utility maximization principles and can accommodate categorical and continuous product characteristics. The methodology can be applied to data from multiple markets and in categories with a relatively large number of alternatives, slow-moving products, and frequent out-of-stocks (unlike many existing approaches). In addition, we illustrate how the model can be used to assist the decisions of a store manager in two ways. First, we show how to quantify the lost sales induced by out-of-stock products. Second, we provide insights on the financial consequences of out-of-stocks and suggest price promotion policies that can be used to help mitigate their negative economic impact, which run counter to simple commonly used heuristics. DEWEY : 658 ISSN : 0025-1909 En ligne : http://mansci.journal.informs.org/content/56/7.toc [article] Structural estimation of the effect of out-of-stocks [texte imprimé] / Andrés Musalem, Auteur ; Marcelo Olivares, Auteur ; Eric T. Bradlow, Auteur . - 2010 . - pp. 1180-1197. Management Langues : Anglais (eng) in Management science > Vol. 56 N° 7 (Juillet 2010) . - pp. 1180-1197 Mots-clés : Aggregate  demand  estimation  Bayesian  methods  Choice  models  Data  augmentation  Inventory  management  Out-of-stocks  Retailing Index. décimale : 658 Organisation des entreprises. Techniques du commerce Résumé : We develop a structural demand model that endogenously captures the effect of out-of-stocks on customer choice by simulating a time-varying set of available alternatives. Our estimation method uses store-level data on sales and partial information on product availability. Our model allows for flexible substitution patterns, which are based on utility maximization principles and can accommodate categorical and continuous product characteristics. The methodology can be applied to data from multiple markets and in categories with a relatively large number of alternatives, slow-moving products, and frequent out-of-stocks (unlike many existing approaches). In addition, we illustrate how the model can be used to assist the decisions of a store manager in two ways. First, we show how to quantify the lost sales induced by out-of-stock products. Second, we provide insights on the financial consequences of out-of-stocks and suggest price promotion policies that can be used to help mitigate their negative economic impact, which run counter to simple commonly used heuristics. DEWEY : 658 ISSN : 0025-1909 En ligne : http://mansci.journal.informs.org/content/56/7.toc