Tariff and Non-Tariff Barriers to Trade; Dumping | UGC NET Economics – Notes

Introduction

International trade theory demonstrates that free trade based on comparative advantage maximizes global welfare. However, in practice, virtually all countries impose restrictions on the free flow of goods and services across borders. These restrictions are broadly classified into tariff barriers, which operate through the price mechanism by taxing imports, and non-tariff barriers (NTBs), which operate through quantitative restrictions, regulatory standards, and administrative procedures. Understanding these instruments, their economic effects, and their welfare implications forms a core component of international trade theory.

Meaning of Tariff

A tariff is defined as a tax or duty imposed by a government on goods that are imported into (or, less commonly, exported from) a country. Tariffs are the oldest and most transparent form of trade policy instrument. The primary objectives behind tariff imposition include protecting domestic industries from foreign competition, generating revenue for the government, correcting balance of payments disequilibrium, and, in some cases, retaliating against unfair trade practices of other nations.

Tariffs can be classified into three major types based on how they are levied.

Specific tariff is a fixed monetary duty charged per physical unit of the imported good, irrespective of its value. It can be expressed as: $$T_s = t \times Q$$ where (t) is the specific duty per unit and (Q) is the quantity imported. For example, a specific tariff of ₹50 per kilogram on imported almonds means every kilogram pays ₹50 regardless of price fluctuations.

Ad valorem tariff is levied as a fixed percentage of the value of the imported good. It is expressed as: $$T_a = \tau \times P_w \times Q$$ where \(\tau\) is the ad valorem rate (expressed as a proportion), and \(P_w\) is the world price of the good. For instance, a 10 percent ad valorem tariff on imported cars means that a car valued at ₹10,00,000 attracts a duty of ₹1,00,000.

Compound tariff combines both specific and ad valorem elements, expressed as: $$T_c = (t \times Q) + (\tau \times P_w \times Q)$$

Partial Equilibrium Effects of a Tariff

The standard partial equilibrium analysis of a tariff uses domestic demand and supply curves along with the world price line. Let \(P_w\) denote the world price under free trade, and let \(D\) and \(S\) represent domestic demand and domestic supply respectively. Under free trade, the country consumes at price \(P_w\), domestic producers supply \(S(P_w)\), domestic consumers demand \(D(P_w)\), and the gap \(D(P_w) – S(P_w)\) is met through imports.

When a tariff (t) is imposed, the domestic price rises to: $$P_d = P_w(1 + \tau)$$ in the ad valorem case, or \(P_d = P_w + t\) in the specific case. This price increase generates four distinct effects, which together constitute the celebrated tariff diagram analysis.

The production effect refers to the expansion of domestic output as producers respond to the higher domestic price, moving along the supply curve. The consumption effect refers to the contraction of domestic consumption as consumers respond to the higher price, moving along the demand curve. The trade effect is the consequent reduction in the volume of imports, equal to the sum of the production and consumption effects. The revenue effect is the tariff revenue collected by the government, calculated as: $$R = t \times M_1$$ where (M_1) is the post-tariff volume of imports.

Welfare Effects and Deadweight Loss

The welfare analysis of a tariff is conducted using the concepts of consumer surplus and producer surplus. A tariff causes consumer surplus to fall because consumers pay a higher price and consume less. Producer surplus rises because domestic producers receive a higher price and expand output. The government gains tariff revenue. However, the loss in consumer surplus exceeds the sum of the gain in producer surplus and government revenue, leaving a net welfare loss, commonly depicted as two triangles in the standard diagram.

The first triangle is called the production distortion loss (or protective effect cost), representing the inefficiency of expanding domestic production of a good beyond the point where domestic marginal cost equals world price, meaning resources are diverted from more efficient uses. The second triangle is the consumption distortion loss, representing the loss in welfare because consumers are forced to reduce consumption below the socially optimal level determined by world price.

The total deadweight loss can be expressed as: $$DWL = \frac{1}{2}(t)(\Delta S) + \frac{1}{2}(t)(\Delta D)$$ where \(\Delta S\) is the increase in domestic production and \(\Delta D\) is the decrease in domestic consumption due to the tariff. This is often referred to as the Harberger triangle loss.