Working Papers

The Expansion of Product Varieties in the New Age of Advertising (with Salomé BaslandzeJeremy Greenwood, and Ricardo Prato  [Paper] March 2023 

The last decades have seen large improvements in advertising technology that allowed firms to target better specific consumers’s tastes. This paper studies the relationship between advertising, the rise of product varieties, and welfare. A model of advertising and product varieties is developed, where firms choose the intensity of digital ads directed at specific consumers as well traditional ads that are undirected. The calibrated model shows that improvements in digital advertising have driven the rise in product varieties over time. Causal empirical evidence, using detailed micro data on firms’ products and advertising choices for the 1995-2015 period and exogenous variation in consumers’ differential access to the internet, supports the suggested mechanism.

Patents to Products: Product Innovation and Firm Dynamics (with David ArgenteSalomé Baslandze, and Douglas Hanley [Paper] March 2023, Reject and Resubmit Quarterly Journal of Economics

We study the prevalence and implications of firms' strategic practices to patent but not commercialize new ideas. We develop a model illustrating that market leaders have higher incentives to use these practices, and we create a novel data set linking patents to products to evaluate the model's implications. We quantify that 62% of patents do not lead to product introductions. These patents imply a 2.5% reduction in the rate of creative destruction.  The possibility of obtaining patent protection without product commercialization also reduces market leaders' innovation efforts, potentially reversing the benefits of the patent system as a whole.  

The Anatomy of Financial Innovation  (with Ana Babus and Matias Marzani) [Paper]  March 2022  

The last three decades have seen rapid growth in the number and variety of securities issued. This paper quantifies innovation in securities, finding that increased variety through specialized new financial products improves firm's ability to raise funds. We develop a model of the allocation of financial products among firms in specific sectors, and estimate that the differential adoption of new financial products, particularly those that are specialized to the financing needs of specific firms, explains most of the observed variation in the amounts of funds raised. 

Scalable Expertise (with David Argente, Ezra Oberfieldand Venky Venkateswaran[Paper] July 2021

We present a theory of firm size, where both scope and expertise are chosen endogenously. The extent to which expertise is scalable (applicable to multiple products), as opposed to local (specific to a particular product), is also chosen by the firm.  We use data on multi-product and multi-establishment firms, and provide empirical evidence in support of the model's predictions.

How do Entrant Build Market Share? The Role of Demand Frictions (with David Argente, Doireann Fitzgerald, and Anthony Priolo) [PaperMarch 2021 

We investigate an explanation for firm growth based on frictions in the accumulation of customers, across and within markets segmented by geography. We use matched retail scanner and advertising data to show that entrants grow both by adding customers in new markets and by reaching new customers in continuing markets. Growth in market share within markets is not associated with changes in markups, but is associated with marketing and advertising. We estimate a structural model and find that frictions in the accumulation of customers contribute substantially to heterogeneity in firm size, and to the gradual process of firm growth.

Firm Dynamics, Persistent Effects of Entry Conditions, and Business Cycles [Paper] April 2018

I provide new evidence that businesses born in downturns start on a smaller scale and remain smaller over their entire lifecycle, and no evidence that these differences attenuate even long after entry. Using data on the productivity and composition of startup businesses, I show that this persistence is related to selection at entry and demand-side channels. I build a model of firm dynamics that shows that when I mute the effects of selection mechanisms, the average initial size differences are more procyclical, but they are less persistent over time. 



The Life Cycle of Products: Evidence and Implications (with David Argente and Munseob Lee[Paper] [Appendix] [Slides]  Accepted Journal of Political Economy 

We document that the sales of individual products decline at a steady pace throughout most of their life cycles, mostly because the appeal of products declines with age. Our empirical and model-based results are consistent with products quickly becoming obsolete as they face competition from newer products of competing firms (business stealing) and from newer products of the same firm (cannibalization). [This paper was previously circulated as ''How do firms grow? The life cycle of products matters''.]

Product Innovation and Credit Market Disruptions (with João Granja), Review of Financial Studies, September  2022  [Paper

We provide new evidence that disruptions in firm’s access to credit during the Global Financial Crisis of 2008 had significant effects on product innovation in the consumer-goods sector.

Innovation and Product Reallocation in the Great Recession (with David Argente and Munseob Lee), Journal of Monetary Economics, January 2018 [Paper] 

We use detailed product- and firm-level data to study the sources of innovation over the period from 2007 to 2013. We document that: (i) entry and exit of products is prevalent among different types of firms; (ii) most reallocation of products occurs within the boundaries of the firm; (iii) product reallocation is strongly pro-cyclical and declined by more than 25 percent during the Great Recession.  


Non-refereed Publications 

The Life Cycle of Businesses and Their Internal Organization (with Elizabeth Weber Handwerker and David Piccone), AEA Papers and Proceedings, May 2021, 111:587-592  [Paper]  

We document new stylized facts on the occupational mix of businesses in the U.S. and on how their internal organization evolves over their life cycles. Our main empirical finding is that younger businesses have fewer hierarchical layers and span of control than comparable older businesses. Our results suggest that businesses become more hierarchical and increase their managerial span of control over their life cycles. We show that this pattern is not entirely driven by selection or differences in size and is pervasive across cohorts and sectors.

Innovation for Innovators: The Financing of Intangibles  (with Ana Babus and Matias Marzani), AEA Papers and Proceedings,  May 2023, 113:268-273  [Paper]  

This paper examines the characteristics of firms that adopt new financial products and its association with measures of performance. We build a novel firm-level panel dataset and document a positive association between intangible capital and the adoption of new products. We also find that access to external financing through new types of securities is associated with size growth and further investments into intangibles. These findings have important implications for understanding the role that financial innovation can play in meeting the financing needs of firms that rely heavily on intangible capital.


Work in Progress 

Firm Dynamics and Internal Organization (with Joana Silva)

The Occupational Mix of New Businesses (with Elizabeth Weber Handwerker and David Piccone)