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“Consumer Choice over Shopping Baskets: A Linear Demand Approach”. September, 2025 - presentation
Standard decision theory assumes consumers maximise utility by making purchase decisions over individual goods. Receipts of observed transactions, however, tend to reflect sets of goods bought jointly such that, as far as the researcher can tell, consumers may be maximising utility via a choice over the entire shopping basket. In this paper, I offer a comprehensive theoretical characterisation of this alternative consumer choice specification, when it may be presumed equivalent to choice over goods, the consequences of miss-specification when it is not, and how structural empirical research can adapt. Furthermore, this paper addresses a trade-off common in demand estimation in empirical Industrial Organisation: rich cross-price effects across many goods, or computational tractability and data density. I show how frequency of joint purchase can serve as an effective proxy for approximating cross-price effects, and estimate markups across several Portuguese supermarkets during international disruptions in 2020-2023.
Lisbon Meetings in Game Theory and Applications, June 2025 - Best Graduate Paper 🎉
"Market Structure and Pass-throughs in Regional Retail Fuel Markets". September, 2025
I develop a cross-nested logit demand system to study how market structure shapes the pass-through of cost shocks in national retail fuel markets, given regional variation in station density. Every gas station is defined as the centroid of a nest: a market within a given radius of said station, to which it and its competitors belong. To mitigate endogenous location choice, parameters are identified within stable windows where the set of local competitors is fixed. I show via simulations that the proposed model can allow for stronger spatial propagation of local shocks than canonical logit models, at higher equilibrium markups. The framework enables counterfactuals on entry, exit, and ownership, that respect realistic geographic substitution.
"Endogenous Multi-Attribute Choice and Market Structure". September, 2025
This paper develops a linear demand framework to investigate endogenous attribute choice in multi-good, multi-attribute settings. The key assumption of the model is that the same factors/attributes which drive goods utility also drive competition in the goods market. When a single multi-product monopolist jointly maximises profits across its portfolio, three configurations can emerge: it may concentrate every desirable attribute in one flagship product; it may launch a vertically ranked line in which each variant offers the same mix of attributes at progressively lower intensities; or it may supply several identical products, each mirroring the others’ attribute levels. However, I prove that a multi-good monopolist never chooses attributes and attribute intensities which yield horizontal differentiation. Preliminary work on extending this approach to single-product oligopolistic firms is also discussed.
“Generics Entry in Competitive Markets with Firm Size Heterogeneity”. December, 2024
How does the entry of a generic variety onto an industry change competitive outcomes, when said industry is composed of firms of distinct sizes? Conventional wisdom in competition policy perceives generics primarily as purveyors of increased market competition and consumer welfare gains. I analyse this question and consider the merits of the prevailing view using a product differentiation model, simultaneously integrating the standard settings of Cournot oligopolistic and Chamberlinian monopolistic competition, facing a new challenge from a perfectly competitive generic variety. I find generics entry to have an ambiguous impact along most dimensions of interest to producers and consumers; significant asymmetric and interacting effects based on firm size heterogeneity; consumer welfare opacity from observable market outcomes; and multiple channels for utility effects, both negative and positive. These results have relevant regulatory implications, suggesting a movement from policies aimed at lowering fixed generics entry costs to more active and granular strategies engaging with the consumer preferences, firm types, and product interactions within each targeted industry.