Journals / NİŞANTAŞI ÜNİVERSİTESİ SOSYAL BİLİMLER DERGİSİ / 2026 / Cilt: 13 Sayı: 1

TRADE WARS AND MARKET VOLATİLİTY: AN ANALYSİS OF TARİFF POLİCİES USİNG THE EGARCH MODEL

TİCARET SAVAŞLARI VE PİYASA OYNAKLIĞI: GÜMRÜK VERGİSİ POLİTİKALARININ EGARCH MODELİ İLE ANALİZİ

Pages
188–208
Publication Date
2025-06-30
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

The findings indicate that the tariffs implemented by the Trump administration had volatility-inducing and persistent effects, particularly on imports from Mexico and China.

📌 3 Key Takeaways

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Objective & Hypothesis:This study examines the impact of additional tariffs imposed by the Trump administration in 2018 on import volatility in the U.S. foreign trade.
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Key Findings & Data:Imports from Mexico, China, Canada, and Germany, which are among the most significant trading partners of the U.S., have been analyzed within the framework of the automotive (Chapter 87), iron-steel (Chapter 73), and machinery (Chapter 84) sectors.
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Conclusion & Impact:The findings indicate that the tariffs implemented by the Trump administration had volatility-inducing and persistent effects, particularly on imports from Mexico and China.
🔬Design:Modeling & Simulation
📍Scope:2018 Verileri
⚙️Variables:Trump Dönemi Tarifeleri · Volatilite · egarch model

Abstract

This study examines the impact of additional tariffs imposed by the Trump administration in 2018 on import volatility in the U.S. foreign trade. Imports from Mexico, China, Canada, and Germany, which are among the most significant trading partners of the U.S., have been analyzed within the framework of the automotive (Chapter 87), iron-steel (Chapter 73), and machinery (Chapter 84) sectors. Monthly import data for the period 2005-2024 have been used, and first differences of the series were taken, followed by the application of the EGARCH model for volatility analyses. The findings indicate that the tariffs implemented by the Trump administration had volatility-inducing and persistent effects, particularly on imports from Mexico and China. In contrast, imports from Canada and Germany exhibited relatively more stable volatility patterns. On a sectoral basis, the persistence of volatility shocks was found to be higher in automotive and machinery imports. Trump's potential re-election in 2025 and the introduction of new tariffs in the iron-steel and automotive sectors pose the risk of creating further uncertainties, especially in import processes with Mexico and China. The study's findings reveal that protectionist policies, such as tariffs, not only reduce import volumes but also negatively affect trade sustainability by causing long-term uncertainties in the market.

Özet

Bu çalışma, Trump yönetiminin 2018 yılında başlattığı ilave gümrük vergilerinin ABD’nin dış ticaretinde ithalat oynaklığı üzerindeki etkisini incelemektedir. ABD’nin en önemli ticaret ortaklarından Meksika, Çin, Kanada ve Almanya’dan yapılan ithalat; otomotiv (87. Fasıl), demir-çelik (73. Fvolasıl) ve makine (84. Fasıl) sektörleri çerçevesinde değerlendirilmiştir. 2005-2024 dönemi aylık ithalat verileri kullanılarak serilerin birinci farkları alınmış ve volatilite analizleri için EGARCH modeli uygulanmıştır. Elde edilen bulgular, Trump yönetimi tarafından uygulanan tarifelerin özellikle Meksika ve Çin’den yapılan ithalat üzerinde oynaklık yaratıcı ve kalıcı etkiler bıraktığını göstermektedir. Kanada ve Almanya ile olan ticarette ise ithalat volatilitesinin görece daha istikrarlı seyrettiği tespit edilmiştir. Sektörel bazda, otomotiv ve makine ithalatında oynaklık şoklarının kalıcılığı daha yüksek bulunmuştur. Trump’ın 2025 yılında ikinci kez göreve gelmesi ve demir-çelik ile otomotiv sektörlerinde yeni tarifeleri uygulamaya koyması, özellikle Meksika ve Çin ile olan ithalat süreçlerinde yeni belirsizlikler yaratma potansiyeline sahiptir. Çalışma bulguları, gümrük tarifeleri gibi korumacı politikaların sadece ithalat hacmini azaltmakla kalmayıp, ticaretin sürdürülebilirliğini olumsuz etkileyerek piyasada uzun vadeli belirsizliklere yol açtığını ortaya koymaktadır.

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Cite This Article

Öztürk, N. S. (2025). TRADE WARS AND MARKET VOLATİLİTY: AN ANALYSİS OF TARİFF POLİCİES USİNG THE EGARCH MODEL. NİŞANTAŞI ÜNİVERSİTESİ SOSYAL BİLİMLER DERGİSİ, Cilt: 13 Sayı: 1, 188–208. https://doi.org/10.52122/nisantasisbd.1648732

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