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Essays in political economy
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What and how did people buy during the Great Lockdown?
Publication . Carvalho, Bruno; Peralta, Susana; Pereira dos Santos, João; NOVA School of Business and Economics (NOVA SBE)
This paper uses novel and comprehensive data on electronic payments from SIBS, the main provider of point of sale terminals and on-line payments in Portugal, to study the impact of the Great Lockdown on purchases. The data aggregates all individual transactions into monthly observations, by municipality and sector, between 2018 and 2020. We employ a difference-in-differences event study that relies on the assumption that the monthly evolution of purchases in the first four months of 2020 would be parallel to that of the two previous years. We identify a massive causal impact on overall purchases, from a baseline year-on-year monthly growth rate of 10% to a decrease of 45%. The sign and magnitude of the impact varies considerably across sectors. Purchases of essential goods such as supermarkets and groceries increase mildly, contrasting with severe contractions in sectors that were closed by government order or depend heavily on tourism, including the leisure industry and restaurants. We find suggestive evidence of initial stockpiling of goods, postponing of essential expenditures, and rapid recovery of purchases in tech and entertainment, possibly to adapt to the confinement. Transactions with foreign-owned cards cause an even greater negative contraction. We disentangle the total effect into the intensive margin of the average transaction and the extensive margin of the number of transactions. Buyers adjust their shopping strategies in rational ways to minimize public health risks: they go less often to supermarkets and buy more each time, and visit local groceries more.
Brown sugar, how come you taste so good?
Publication . Gonçalves, Judite; Pereira dos Santos, João; NOVA School of Business and Economics (NOVA SBE); Elsevier
Increasing obesity-related problems and rising healthcare expenditures have led governments in developed countries to consider the introduction of soda taxes. We study a recent such tax, implemented in Portugal in February 2017 —one of the first soda taxes worldwide that increases with sugar content (0.08 euros per liter for drinks with less than 80 g of sugar per liter, and 0.16 euros per liter for drinks with 80 g or more sugar per liter, plus VAT). We use extremely detailed panel data from one of the two largest retailers in the country, covering the period between February 2015 and January 2018. We take advantage of the tax breakdown by sugar levels to examine how soda prices and quantities purchased reacted. For identification, we rely on difference-in-differences models with various vectors of fixed effects, comparing each group of products to water. For drinks with more than 80 g of sugar per liter, results indicate almost full price pass-through to the consumer. For drinks with less than 80 g of sugar per liter, price pass-through surpassed 100%. Regarding consumption, our findings suggest stockpiling behavior in the quarter when the tax was approved and before it was actually implemented. In the implementation period, there are no significant changes in quantities purchased for most beverages vis-à-vis water, with the exception of soda drinks with comparatively low levels of sugar. This suggests that benefits of the soda tax in terms of reducing sugar intake are mainly due to reformulation, as producers reduced the sugar content of some drinks to fall below the 80 g per liter threshold.
Collateral damage?
Publication . Cabral, Sónia; Martins, Pedro Silva; Pereira dos Santos, João; Tavares, Mariana; NOVA School of Business and Economics (NOVA SBE); Blackwell Publishing Ltd
The increasing range and quality of China's exports is a major development internationally with potentially far-reaching effects. In this paper, on top of the direct labour market effects of imports from China studied in previous research, we also measure the indirect effects stemming from increased export competition in third markets. Our findings, based on matched employer–employee data of Portugal covering the period 1991–2008, indicate that workers’ earnings and employment are significantly negatively affected by China's competition, but only through the indirect ‘market-stealing’ channel. In contrast to earlier evidence, the direct effects of Chinese imports are mostly non-significant. The results are robust to a number of checks and also highlight particular groups more affected by indirect competition, including women, older and less educated workers, and workers in larger, older and domestic firms.
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Fundação para a Ciência e a Tecnologia
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PD/BD/128121/2016