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Two identical firms who start exporting in different months, one each in January and December, will report dramatically different exports for the first calendar year. This partial-year effect biases down first year export levels and biases up first-year export growth rates. For Peruvian exporters, the partial-year bias is large: first-year export levels are understated by 54 percent and the first-year growth rate is overstated by 112 percentage points. Correcting the partial-year effect dramatically reduces first-year export growth rates, raises initial export levels, and almost doubles the contribution of net firm entry and exit to overall export growth.

Special economic zones (SEZ), one of the most important instruments of industrial policy used in developing countries, often impose export share requirements (ESR). That is, firms located in SEZ are required to export more than a certain share of their output to enjoy a wide array of incentives—a practice prohibited by the World Trade Organization (WTO) Agreement on Subsidies and Countervailing Measures. In this paper we exploit the staggered removal of ESR across products and over time in the SEZ of the Dominican Republic—a reform driven by external commitments to comply with WTO disciplines on subsidies—to evaluate how ESR affect export performance at the product and firm levels. Using customs data on international trade transactions from the period 2006 to 2014, we find that making the Dominican SEZ regime WTO-compliant made SEZ more attractive locations for exporters to be based in. The reform, however, did not have a significant effect on the country's exports or on the share of export value originating from SEZ.

BackgroundDuring the COVID-19 pandemic, several questions have arisen about which endoscopic procedures (EPs) must be performed and which ones can be postponed. The aim of this study was to conduct a nationwide survey regarding the appropriate timing of EPs during the COVID-19 pandemic.MethodsThis prospective study was performed through a nationwide electronic survey. The survey consisted of 15 questions divided into three sections. The first evaluated the agreement for EPs classified as “time sensitive” and “not time sensitive”. Two other sections assessed “high-priority” and “low-priority” scenarios. Agreement was considered when > 75% of respondents answered a question in the same direction.ResultsThe response rate was 27.2% (214/784). Among the respondents, agreement for the need to perform EP in < 72 h was only reached for variceal bleeding (93.4%). Dysphagia with alarm symptoms was the scenario in which the highest percentage of physicians (95.9%) agreed that an EP needed to be performed within a month. Less than 30% of endoscopists would perform an EP within the first 72 h for patients with mild cholangitis, non-variceal upper gastrointestinal bleeding without hemodynamic instability, or severe anaemia without overt bleeding. In time-sensitive clinical scenarios suggestive of benign disease, none of the scenarios reached agreement in any sense. Among the time-sensitive clinical scenarios suggestive of malignancy, > 90% of the surveyed respondents considered that EP could not be postponed for > 8 weeks.ConclusionsThere was no consensus among endoscopists about the timing of EPs in patients with pathologies considered time sensitive or in those with high-priority pathologies. Agreement was only reached in five (17%) of the evaluated clinical scenarios.

Preoperative management of patients living with severe obesity can be challenging; in this context, the preoperative weight loss may help to obtain better outcomes and less morbidity for bariatric surgery. Therefore, we evaluated the effectiveness of GLP-1 analogue Liraglutide in preoperative weight loss. We performed a single-center, quasi-experimental prospective study. Eligible participants were adults in preoperative management for bariatric-metabolic surgery with body-mass index ≥ 48 kg/m 2 . All patients were assigned liraglutide treatment, with an initial dose of 0.6 mg subcutaneous per day, the dose was increased each week until reaching 3.0 mg for 12 weeks. Weight loss and body composition were evaluated monthly using bioelectric impedance (BIA) (InBody 770 Scale®). We analyzed data using descriptive statistics, central tendency measures and dispersion for quantitative variables and absolute and relative frequencies for qualitative variables. A total of 37 individuals were included in this study, 28 (76%) were female and 9 (24%) were males, with an average age of 44 years. About the BMI, 19 patients (51%) had a BMI > 50 kg/m 2 , 10 (27%) > 40 kg/m 2 and 8 (22%) > 60 kg/m 2 ; with a total average BMI of 56.04 kg/m 2 . The initial weight was 147.4 ± 14.9 kg which decreased to 139.3 ± 16.8 kg; after 3 months of liraglutide administration. A total of 35 patients had some degree of weight loss (94.6%), while 2 (5.40%) had no weight changes. The total weight loss was 5.50% at 3 months of liraglutide treatment. Liraglutide could be an effective adjuvant therapy for preoperative weight loss in patients living with severe obesity.

Despite the widespread tariff reductions sparked by the Dominican Republic-Central America Free Trade Agreement, anecdotal evidence suggests that borders in the region remain thick, with many hurdles standing in the way of regional integration. This paper uses a newly collected dataset to quantify the incidence of sanitary and phytosanitary measures and technical barriers to trade in the region. The results indicate that Central America has the lowest prevalence of technical non-tariff measures in the world. However, substantial heterogeneity is observed among countries. The paper estimates that the impact of sanitary and phytosanitary measures on border prices is equivalent to an ad-valorem tariff of 11.6%. This effect is further investigated by looking in detail at the effect on the prices of beef, chicken meat, bread, and dairy products in Guatemala. The impact is estimated to be equivalent to an ad-valorem tariff of 68.4%, 51.4%, 22.0%, and 5.0%, respectively. The paper shows that efforts to streamline key sanitary and phytosanitary measures affecting these products by, for example, reducing the cost and time required to obtain sanitary registries, would likely reduce the Guatemalan urban extreme poverty rate from 5.07% to 4.91%.

Idiopathic acute recurrent pancreatitis (IARP) is defined as at least two episodes of acute pancreatitis with the complete or near-complete resolution of symptoms and signs of pancreatitis between episodes, without an identified cause. There is a paucity of information about the usefulness of endoscopic ultrasound (EUS) in IARP.ObjectivesTo determine the diagnostic yield of EUS in IARP.DesignA retrospective study was performed in patients with IARP evaluated by EUS between January 2009 and December 2016. Follow-up assessments of acute pancreatitis recurrence were carried out.ResultsSeventy-three patients with 102 EUS procedures were included. EUS was able to identify the cause of IARP in 55 patients (75.3%). The most common findings were chronic pancreatitis in 27 patients (49.1%), followed by lithiasic pathology in 24 patients (43.6%), and intraductal papillary mucinous neoplasm in four patients (7.3%). A directed treatment against EUS findings had a protective tendency associated with the final resolution of recurrence. There were no complications reported.ConclusionEUS performed in patients with IARP helped to identify a possible cause in 2/3 of the cases. The majority of patients have a treatable disease.

Two otherwise identical firms that enter the same market in different months, one in January and one in December, will report dramatically different annual sales for the first calendar year of operations. This partial year effect in annual data leads to downward biased observations of the level of activity upon entry and upward biased growth rates between the year of entry and the following year. This paper examines the implications of partial year effects using Peruvian export data. The partial year bias is very large: the average level of first-year exports of new exporters is understated by 65 percent and the average growth rate between the first and second year of exporting is overstated by 112 percentage points. This paper re-examines a number of stylized facts about firm size and growth that have motivated rapidly expanding theoretical and empirical literatures on firm export dynamics. Correcting the partial year effect eliminates unusually high growth rates in the first year of exporting, raises initial export levels, and shifts 10 percent of market entrants from below to above the median size. Revisiting an older set of facts on firm size and growth, the paper finds that correcting for partial year biases reduces the number of small firms in the firm size distribution and weakens the negative relationship between firm growth and firm size.

The dissertation studies two Non-tariffs Barriers to International Trade (NTBs) as they relate to trade liberalizations. Chapter 1 develops a theoretical model to explain the observed heterogeneity in the adoption of antidumping laws by small developing countries in an environment of multilateral tariff reduction. The analysis is based on a three-stage game of trade policy determination with imperfect competition in differentiated products where the potential lobby for protection is reflected in the government’s objective function and where tariffs may be bound due to multilateral trade agreements. This framework implies that the implementation of this administrative protection device is the government’s best response when multilateral bound tariffs reach a sufficiently low threshold. The heterogeneity in the adoption decision is explained by the relative size of the domestic market, the degree of product differentiation, and political economy motives. In chapter 2, I develop a new World Bank database of European standards for electronic products to study the impact of harmonization of product standards on European Union imports. We employ a gravity model to conclude that European Union standards for electronic products that are harmonized to international standards have a positive and significant effect on trade. Chapter 3 further investigates this finding by decomposing the effect that harmonization entails into the intensive and extensive margins of trade. Using a highly detailed dataset that links U.S. international trade transactions to U.S. firms and a new industry-level database of EU product standards, I find that harmonization increases U.S. exports to the EU and that this increase is due to more U.S. firms entering the EU market -the extensive margin of trade. New entrants to the EU region are drawn mainly from the most productive set of firms already exporting to less stringent markets before harmonization -The extensive margin of trade composition. I also find that harmonization decreases export sales at existing exporters -the intensive margin of trade. These findings are consistent with a model featuring the role of product standards heterogeneity across market destinations and productivity heterogeneity across firms.

This paper examines the performance of globally engaged firms in Argentina in the past decade. Using highly disaggregated firm-level customs transaction data for imports and exports, the paper documents the progressive retreat of Argentine firms from global markets. Between 2007 and 2017, the number of exporters decreased by 30 percent. Benchmarking the characteristics of these exporters with similar countries reveals that Argentine exporters are disproportionally fewer and individually larger, with export value extremely concentrated in a few firms. Firm churning rates are disproportionately low and survival rates of entrants are high. These findings reflect exceptionally high entry costs of export, which are the result of anti-export bias and import substitution policies that sought unsuccessfully to develop the local industry. The paper shows that exporters that import directly intermediate and capital goods have better export outcomes than other exporters.

This paper studies the impact of a `textbook' ad-valorem export subsidy on firm-level export performance. The Cash Incentive Scheme for Exports (CISE) program offered by the government of Nepal offers a cash subsidy to firms exporting a select group of products to countries other than India. Using customs transactions data combined with subsidy disbursements at the firm level from 2011 to 2014, we estimate the impact of the subsidy on exports of targeted and non-target product-destination combinations and their extensive and intensive margins. We employ a range of doubly-robust matching estimators to control for the non-random selection of exporters into the scheme. We find that subsidized firms increased their exports of targeted product-destinations relative to firms in the control group and that this rise is fully accounted for by the extensive margin: a higher number of targeted products exported and foreign markets served. We do not find any significant changes along the intensive margin nor among non-targeted product-destination combinations. While our results show that the CISE scheme fomented export diversification, its limited impact on total exports and high fiscal cost call into question its effectiveness.