International Economics Exam Revision

International trade theory explains why countries engage in trade and what determines the patterns of exports and imports. This chapter introduces the foundational models that shed light on the benefits of specialization and the drivers of trade flows.

Even if a country has an absolute disadvantage in all goods, it can still benefit from trade by specializing in and exporting the good where its relative disadvantage is smallest, which corresponds to its comparative advantage.

The Production Possibility Frontier (PPF) illustrates the maximum output combinations a country can produce with its given resources and technology. In the Ricardian model, the PPF is a straight line, signifying constant opportunity costs.

The slope of the PPF represents the opportunity cost of producing one good in terms of the other. With trade, countries can consume beyond their domestic PPF, indicating the gains from specialization and exchange.

The Ricardian model simplifies trade by assuming only one factor of production: labor. Trade patterns are determined by differences in labor productivity, which translate into differences in opportunity costs and comparative advantage.

Under this model, each country specializes in the production of the good where it has a lower opportunity cost, leading to increased overall production and mutual gains from trade.

The Heckscher-Ohlin (H-O) model extends the Ricardian framework by incorporating two factors of production, typically capital and labor. It posits that trade arises from differences in factor endowments across countries, not just technology.

The core H-O theorem states that a country will export the good that intensively uses its relatively abundant factor of production. Conversely, it will import goods that intensively use its relatively scarce factor.

For example, if trade raises the price of capital-intensive goods, the real wages of capital owners will increase, while the real wages of workers (the other factor) will decrease in that country. This highlights the distributional consequences of trade.

This occurs because trade in goods effectively acts as an indirect trade in the services of the factors embodied in those goods. However, in practice, complete factor price equalization is rarely observed due to factors like trade barriers and technological differences.

Possible explanations for the paradox include the importance of skilled labor (human capital), differences in natural resources, and demand preferences that might lead to a home bias in consumption.

Classical trade models, such as the Ricardian and Heckscher-Ohlin models, primarily explain trade based on comparative advantage driven by differences in technology or factor endowments. However, these models struggle to account for phenomena like intra-industry trade or trade between similar countries, leading to the development of modern trade theories that incorporate increasing returns to scale and imperfect competition.

The Krugman model of trade integrates monopolistic competition and internal economies of scale. In this framework, firms produce differentiated products and face downward-sloping demand curves. International trade expands the market size, intensifying competition but also allowing firms to produce at a larger scale, thereby lowering their average costs. This leads to both lower prices for consumers and a greater variety of available products.

Intra-industry trade refers to the two-way exchange of similar products within the same industry between countries. This type of trade is common among countries with similar income levels and geographical proximity, especially those involved in economic integration agreements.

Intra-industry trade is generally associated with lower adjustment costs compared to inter-industry trade, as workers can transition within the same industry rather than having to move to entirely different sectors.

Regional trade agreements, such as Free Trade Areas (FTAs) and Customs Unions, represent various levels of economic integration among member countries. These agreements aim to reduce or eliminate trade barriers among members, but their welfare effects are complex and depend on whether they lead to trade creation or trade diversion.

An RTA enhances global welfare if the positive effects of trade creation outweigh the negative effects of trade diversion. This is more likely when member countries are natural trading partners and external tariffs are relatively low.

The World Trade Organization (WTO) underpins the multilateral trading system with core principles like Most-Favoured-Nation (MFN) and National Treatment. These principles aim to ensure non-discrimination in international trade, fostering a level playing field among all members.

While RTAs offer benefits to members, they inherently deviate from the MFN principle by providing preferential treatment to partner countries. This creates a tension with the WTO's goal of universal non-discrimination, necessitating careful evaluation of their impact on global trade flows.

Tariffs are taxes imposed on imported goods, raising their domestic price above the world price. They are a common form of trade barrier, primarily used to protect domestic industries from foreign competition or to generate government revenue. Tariffs can be classified into different types based on how they are calculated.

There are three main types of tariffs: specific tariffs, which are a fixed charge per unit of imported goods (e.g., $5 per ton of steel); ad valorem tariffs, which are a percentage of the imported good's value (e.g., 10% of the car's price); and compound tariffs, which combine both a specific and an ad valorem component.

The welfare effects of a tariff differ significantly depending on whether the importing country is considered 'small' or 'large' in the global market. A small country is a price-taker, meaning its import decisions do not affect the world price. Conversely, a large country can influence world prices through its import demand.

For a small country, a tariff raises the domestic price by the full amount of the tariff. This leads to a decrease in consumer surplus (consumers pay more and buy less) and an increase in producer surplus (domestic producers receive a higher price and produce more). The government gains revenue from the tariff, but the overall net welfare effect is always negative due to deadweight losses.

These deadweight losses arise from two distortions: a production distortion (area 'b') where inefficient domestic production replaces cheaper imports, and a consumption distortion (area 'd') where consumers reduce their consumption due to the higher price. For a small country, free trade is always the optimal policy, as tariffs inevitably reduce national welfare.

A large country, by imposing a tariff, reduces its demand for imports, which can lower the world price of the imported good. This creates a terms-of-trade gain (area 'e'), as foreign suppliers effectively pay a portion of the tariff. The net welfare effect for a large country is the terms-of-trade gain minus the production and consumption deadweight losses.

It is theoretically possible for a large country to achieve a net welfare gain if the terms-of-trade gain outweighs the deadweight losses. The optimal tariff for a large country is the rate that maximizes this national welfare, usually given by the inverse of the foreign export supply elasticity (t* = 1/e*). However, this can provoke retaliation from trading partners, leading to a trade war where all countries lose.

The effective rate of protection (ERP) measures the actual protection provided to a domestic industry's value-added, accounting for tariffs on both final goods and intermediate inputs. It often differs from the nominal tariff rate on the final product.

Tariff escalation occurs when nominal tariff rates on manufactured products are higher than on intermediate inputs and raw materials. This practice results in a much higher effective rate of protection for the processing stages of an industry, encouraging domestic manufacturing but potentially hindering industries that use these processed goods as inputs.

The total deadweight loss (DWL) from a tariff is the sum of the production distortion loss and the consumption distortion loss. It can be quantified using changes in quantity and the tariff rate. The magnitude of this loss is significantly influenced by the elasticity of domestic supply and demand.

Higher elasticities of supply and demand mean that quantities respond more significantly to the price changes induced by a tariff, leading to larger production and consumption distortions and, consequently, greater deadweight losses. Conversely, if supply and demand are highly inelastic, the quantity changes are small, and the deadweight loss will be less severe.

Non-tariff barriers (NTBs) are policies other than tariffs that restrict international trade. As tariffs have declined due to multilateral trade agreements, NTBs have become increasingly significant. They include measures such as import quotas, voluntary export restraints, subsidies, and technical regulations.

An import quota sets a direct limit on the quantity of a good that can be imported. While a tariff raises the domestic price, leading to government revenue, a quota restricts quantity, with the price effect often captured by license holders as "quota rents." In competitive markets, a quota can have equivalent price and quantity effects to a tariff, but it is generally considered less desirable due to its rigidity and potential for rent-seeking.

Unlike tariffs, which automatically adjust with market conditions, quotas are fixed quantity limits, offering less flexibility. For a large importing country, a tariff might reduce the world price, leading to a terms-of-trade gain, whereas a quota has less impact on the world price.

The key consequence of a VER is that the rents from the restricted trade accrue to the foreign exporters rather than to the importing country's government or domestic license holders. This makes VERs particularly costly for the importing country's welfare.

Dumping can take various forms, such as predatory dumping (to drive out competitors), persistent dumping (price discrimination), or sporadic dumping (to clear excess inventory). Anti-dumping duties (ADDs) are tariffs imposed on dumped imports to counteract their price advantage. While legal under WTO rules as a trade remedy, ADDs are frequently criticized for being used as a protectionist tool.

Subsidies are government payments to domestic producers, which can distort trade. Export subsidies directly encourage exports by lowering their price for foreign buyers, while domestic production subsidies reduce the cost of producing goods for both domestic and international markets. Both types can give domestic firms an unfair advantage over foreign competitors.

Technical Barriers to Trade (TBTs) refer to product standards, labeling requirements, and safety regulations that can restrict imports if foreign products do not meet them. Sanitary and Phytosanitary (SPS) measures are specifically related to food safety and animal or plant health. While often legitimate for public health or safety, these measures can be used to discriminate against imports, creating non-tariff barriers.

The infant industry argument suggests that new industries in developing countries may need temporary protection from international competition to develop economies of scale and gain experience (learning-by-doing). This argument is considered valid only if there is a market failure (e.g., capital market imperfections) preventing private investment and if the protection is temporary, being removed once the industry matures and becomes competitive.

Strategic trade policy argues for government intervention in imperfectly competitive global markets, particularly those characterized by increasing returns to scale and oligopoly. The goal is to shift profits (rents) from foreign firms to domestic firms, especially in high-technology sectors. However, this policy is risky due to potential foreign retaliation, the difficulty of 'picking winners,' and often being subject to WTO rules.

The terms-of-trade argument suggests that large countries can improve their terms of trade by imposing tariffs, although this risks retaliation. Second-best arguments propose that trade policy can correct domestic market distortions like externalities or monopolies, though domestic policies are generally more efficient. Non-economic arguments include national security, preservation of culture, and food security.

Protectionist policies often arise not from economic efficiency but from political economy dynamics. Industries and workers that benefit from protection (e.g., import-competing sectors) have concentrated interests, giving them a strong incentive to lobby for trade barriers. The costs of protection, however, are typically diffused across many consumers, making organized opposition less likely.

This leads to rent-seeking, where resources are expended lobbying for protection rather than being used for productive activities. Consequently, most protection is the result of political maneuvering and special interest groups capturing benefits, rather than an optimal economic policy that maximizes national welfare.

The General Agreement on Tariffs and Trade (GATT), established in 1947, provided a framework for reducing tariffs through multilateral negotiations. It was succeeded by the World Trade Organization (WTO) in 1995, which expanded its scope to include services, intellectual property, and more robust dispute settlement mechanisms.

WTO members commit to maximum ceiling rates for their tariffs, known as bound tariffs, which cannot be raised without negotiation and compensation. Trade rounds are multilateral negotiations aimed at progressively lowering trade barriers, such as the Kennedy, Tokyo, and Uruguay Rounds. The Doha Round, initiated in 2001, primarily focused on development issues but has largely stalled.

Regional Trade Agreements (RTAs) allow member countries to grant preferential treatment to each other, forming various levels of economic integration. These agreements are exceptions to the MFN principle of the WTO but are permitted under specific conditions.

RTAs can lead to trade creation, where inefficient domestic production is replaced by lower-cost imports from a partner country, increasing welfare. However, they can also cause trade diversion, where imports shift from a more efficient non-member to a less efficient member due to preferential tariffs, potentially reducing global welfare. An RTA is welfare-improving if the benefits of trade creation outweigh the costs of trade diversion.

Key criteria for an OCA include high labor mobility, symmetric economic shocks across member countries, and mechanisms for fiscal transfers to cushion asymmetric shocks. Additionally, open and integrated economies where trade gains outweigh the loss of exchange rate flexibility are better suited. The Eurozone's suitability as an OCA is often debated due to differing economic structures and limited fiscal integration among its members.

The Balance of Payments (BOP) is a comprehensive record of all economic transactions between a country's residents and the rest of the world over a specified period. It provides a structured overview of a nation's international economic activity, including trade, financial flows, and transfers.

The BOP is divided into three main accounts: the Current Account, the Capital Account, and the Financial Account. Each transaction is recorded using a double-entry bookkeeping system, meaning every international transaction is entered as both a credit and a debit, ensuring the overall balance always sums to zero.

The Current Account primarily records transactions related to goods, services, income, and current transfers. Its largest component is typically the balance of trade, which measures the difference between a country's exports and imports of goods.

A country running a Current Account surplus earns more from these transactions than it spends, making it a net lender to the rest of the world. Conversely, a Current Account deficit means the country spends more than it earns and must finance this by borrowing from abroad, typically resulting in a net financial inflow.

The Financial Account records international purchases and sales of financial assets. These transactions can be categorized into Foreign Direct Investment (FDI), portfolio investment, and other investments such as loans and deposits. Changes in a country's official reserve assets are also recorded here.

Portfolio investment involves buying foreign stocks and bonds without gaining controlling ownership, while other investment includes cross-border loans, bank deposits, and trade credits. Official reserve assets refer to holdings of foreign currencies, gold, and Special Drawing Rights by a country's central bank.

The Capital Account is generally smaller in magnitude than the Current or Financial Account. It records capital transfers, such as debt forgiveness, non-produced non-financial assets (e.g., patents, copyrights), and transfers of migrants' assets.

The fundamental accounting identity of the Balance of Payments states that the sum of the Current Account, Capital Account, and Financial Account must equal zero. This reflects the double-entry bookkeeping system where every international transaction generates both a credit and a debit of equal value.

Due to practical difficulties in data collection, the sum of these accounts often does not perfectly balance. This difference is recorded as a statistical discrepancy to ensure the BOP equation holds. A current account deficit implies that a country is borrowing from abroad (net financial inflow), resulting in a financial account surplus. Conversely, a current account surplus means a country is lending to the rest of the world (net financial outflow), leading to a financial account deficit.

Official reserve transactions reflect changes in a country's official foreign exchange reserves held by its central bank. These transactions are part of the financial account and typically occur when the central bank intervenes in the foreign exchange market to influence the value of its domestic currency or to manage its exchange rate regime. For example, a decrease in official reserves indicates that the central bank sold foreign currency, usually to support its own currency.

The foreign exchange market facilitates the exchange of one currency for another. The exchange rate (e) is the price of one currency in terms of another, for example, $1.10 per €1. A spot rate is for immediate transactions, while a forward rate is agreed today for a future transaction, allowing parties to hedge against exchange rate risk.

Purchasing Power Parity (PPP) is a theory explaining exchange rate determination in the long run. It suggests that exchange rates adjust so that a basket of goods and services costs the same in different countries when expressed in a common currency. This theory comes in two main forms: absolute PPP and relative PPP.

Interest Rate Parity (IRP) is a no-arbitrage condition in financial markets. It posits that the returns on comparable assets in different currencies should be equal once adjusted for expected exchange rate changes. Covered IRP uses the forward exchange rate to eliminate currency risk, while Uncovered IRP relies on the expected future spot rate, thus retaining exchange rate risk.

The Expected Uncovered Interest Differential (EUID) is the difference between the return on a domestic investment and the expected return on an uncovered foreign investment. In equilibrium, under UIP, the EUID should be zero, meaning there are no arbitrage opportunities. If EUID is not zero, capital flows will occur to exploit the differential until parity is restored. A common approximation for the EUID is the expected appreciation or depreciation of the foreign currency plus the interest rate differential ($F^x + (i^f - i)$).

The International Fisher Effect builds on PPP and IRP. It states that the difference in nominal interest rates between two countries should be equal to the difference in their expected inflation rates. This also implies that the currency of the country with a higher nominal interest rate will tend to depreciate against the currency of the country with a lower nominal interest rate, reflecting higher expected inflation.

While the nominal exchange rate (e) is the price of one currency in terms of another, the real exchange rate (q) measures the relative price of goods and services between two countries. It is an indicator of international competitiveness.

The exchange rate is determined by the intersection of supply and demand for currencies. Demand for a currency comes from foreigners wanting to buy domestic goods, services, or assets (e.g., exports, FDI inflows). Supply of a currency comes from domestic residents wanting to buy foreign goods, services, or assets (e.g., imports, capital outflows). Shifts in these curves, driven by factors like interest rate changes, inflation expectations, or trade flows, lead to changes in the equilibrium exchange rate.

Expectations play a critical role in foreign exchange markets. A self-fulfilling prophecy occurs when investors' beliefs about future exchange rate movements actually cause those movements to happen. For example, if investors suddenly expect a foreign currency to depreciate, they will sell that currency now, increasing its supply in the market and causing its immediate depreciation. This validates their initial expectation and can lead to a sudden and severe currency crisis, even without a significant change in economic fundamentals.

The Mundell-Fleming model extends the traditional IS-LM framework to open economies, incorporating capital mobility and exchange rates. This model is crucial for understanding how monetary and fiscal policies operate under different exchange rate regimes. A key concept related to open economies is the absorption approach, which states that a current account deficit implies a country is absorbing (spending) more than it produces (Y - A). To improve the current account, a country must either increase its output or reduce its domestic spending.

Under a fixed exchange rate regime, the central bank must intervene in foreign exchange markets to maintain the target rate. This intervention limits the central bank's ability to conduct independent monetary policy. Conversely, with flexible exchange rates, monetary policy is effective because the central bank can influence output through changes in the exchange rate, which then affects net exports. Fiscal policy, however, becomes less effective under flexible rates as government spending can lead to currency appreciation, reducing net exports and offsetting the initial stimulus.

The Impossible Trinity highlights the trade-offs governments face in designing their macroeconomic policies. For instance, the Gold Standard system prioritized fixed exchange rates and free capital movement but required countries to surrender monetary policy autonomy. The Bretton Woods system allowed for fixed exchange rates and independent monetary policies but necessitated restrictions on capital flows. Today, many developed economies operate with free capital mobility and independent monetary policy, accepting flexible exchange rates.

Exchange rate regimes exist along a spectrum, ranging from highly rigid fixed systems to entirely market-determined flexible systems. Each regime offers different benefits and drawbacks, impacting a country's economic stability and policy independence. The choice of regime is critical for national economic management.

Fixed exchange rates reduce uncertainty, encouraging trade and investment, and can impose discipline on monetary policy to fight inflation. However, they limit a country's ability to respond to domestic shocks. Flexible exchange rates offer monetary policy independence and automatic adjustment to external imbalances, for example, a depreciation can make exports cheaper and imports more expensive, improving the trade balance.

Currency crises are periods of sharp currency depreciation or forced devaluation, often leading to severe economic disruption. Economists have developed several models to explain their causes and mechanisms, broadly categorized into three generations.

The first-generation models, exemplified by Krugman's work, attribute crises to inconsistent government policies, specifically large fiscal deficits combined with fixed exchange rates. Money creation to finance deficits erodes foreign exchange reserves, eventually leading to a speculative attack and a forced devaluation. Second-generation models (e.g., Obstfeld) emphasize self-fulfilling prophecies, where market expectations of devaluation can trigger a crisis even without weak economic fundamentals, due to multiple equilibria. Third-generation models focus on balance sheet mismatches, where firms or governments with foreign-currency denominated debt but domestic-currency revenues face severe distress if the domestic currency depreciates, as seen in the 1997 Asian financial crisis.

The concept of an Optimal Currency Area (OCA) helps evaluate the suitability of a region for a single currency. Key criteria for an OCA include high labor mobility, symmetric economic shocks, fiscal transfer mechanisms to cushion asymmetric shocks, and deeply integrated economies. The Eurozone, for instance, meets some criteria like trade integration but faces challenges with low labor mobility and limited fiscal transfers, as highlighted during the Greek debt crisis where the inability to devalue the currency led to costly internal devaluation.