International economic issues (A Level) · ⁨ปัญหาเศรษฐกิจระหว่างประเทศ (A-Level)⁩

A country with a large balance of payments 国际收支 problem — usually a deficit on the current account 经常账户 — can use two kinds of policy.

• expenditure-reducing 支出减少 policies cut total demand (higher taxes or interest rates). With less spending, people buy fewer imports. But growth slows and unemployment may rise.
• expenditure-switching 支出转换 policies move spending away from imports towards home goods. The main tool is a lower exchange rate 汇率 — a depreciation 贬值 under floating rates, or a devaluation 法定贬值 under a fixed system — which makes exports cheaper and imports dearer.

The Marshall–Lerner condition and the J-curve

A lower exchange rate only improves the current account if buyers respond enough. The Marshall-Lerner condition 马歇尔勒纳条件 says the sum of the price elasticities of demand for exports and imports must be greater than one:

Worked example. After a depreciation, the demand for a country's exports has $PED = 0.6$ and its demand for imports has $PED = 0.7$. Will the current account improve?

so the Marshall-Lerner condition is met, and the depreciation should improve the current account in the long run. (If the two elasticities had summed to less than $1$ — for example $0.3 + 0.4 = 0.7$ — a depreciation would make the deficit worse.)

Even when this holds, the gain takes time. The J-curve effect J曲线效应 describes what happens: just after a depreciation, the current account first gets worse (imports cost more straight away, but trade volumes are slow to change), then later improves as buyers adjust — tracing the shape of a letter J.

An exchange rate is the price of one currency in terms of another. There is more than one way to measure it:

• the nominal exchange rate 名义汇率 is the everyday market rate between two currencies.
• the real exchange rate 实际汇率 adjusts the nominal rate for differences in prices between the countries, so it shows true competitiveness.
• the trade-weighted exchange rate 贸易加权汇率, also called the effective exchange rate 有效汇率, is an average of a currency's value against all its trading partners, weighted by how much trade is done with each.

The three systems

• a floating exchange rate 浮动汇率 is set by the demand for and supply of the currency.
• a fixed exchange rate 固定汇率 is held at a set value by the central bank.
• a managed exchange rate 管理浮动汇率 mostly floats, with the central bank stepping in at times.

Under floating rates, a rise in value is an appreciation 升值 and a fall is a depreciation. Under a fixed system, a deliberate rise is a revaluation 法定升值 and a deliberate fall is a devaluation. A weaker currency tends to raise exports and inflation; a stronger currency does the opposite.

It is important not to confuse two ideas:

• economic growth 经济增长 is simply a rise in real output.
• economic development 经济发展 is wider. It is about people's standard of living 生活水平 — their health, education, and freedom of choice, not just their income.

A country can grow without developing much (if the extra income goes to a few people). Development usually means rising incomes plus better health, more schooling, and less poverty.

Measuring development

The best-known measure is the Human Development Index 人类发展指数 (HDI). It combines three things into one number between 0 and 1:

• income (GNI per person),
• health (life expectancy 预期寿命 at birth),
• education (mean and expected years of schooling 受教育年限).

Other useful signs of development include access to clean water, the number of doctors per person, and mobile-phone and internet use.

We often compare a developed country 发达国家 (high income, like Germany) with a developing country 发展中国家 (lower income, like Kenya). They differ in clear ways:

The employment structure 就业结构 also differs. As a country develops, workers move out of the primary sector 第一产业 (farming and mining), into the secondary sector 第二产业 (making goods), and later into the tertiary sector 第三产业 (services).

Many things shape development: savings and investment, the quality of education and health, infrastructure, stable government and law, and access to world markets.

Richer and poorer countries are linked in several ways, each with good and bad sides.

• trade can raise incomes, but many developing countries rely on a few primary exports whose prices swing sharply.
• foreign aid 援助 can fund schools and roads, but it may create dependency or be wasted.
• debt 债务 owed to other countries can pay for development, but repaying it can drain a poor country's budget.
• foreign direct investment 外国直接投资 (FDI) by a multinational corporation 跨国公司 brings money, jobs and technology, but profits may flow back abroad and workers may be poorly treated.
• migration 移民 of workers can ease unemployment and bring in remittances 侨汇 (money sent home), but it can also drain a country of its most skilled people.

globalisation 全球化 is the growing links between countries — in trade, money, technology and people — so that the world acts more like one market. Its causes include cheaper transport and communication, free trade 自由贸易 agreements, and the spread of multinational firms.

Countries often join a trade bloc 贸易集团 — a group that trades freely among themselves (like the European Union).

Benefits and costs

Globalisation helps developed and developing economies in different ways, but the gains are not shared evenly, which is why it remains so argued about.

• Distinguish expenditure-reducing from expenditure-switching policies for a deficit.
• Explain the Marshall-Lerner condition ($PED_x + PED_m > 1$) and the J-curve (the deficit worsens before it improves).
• Compare development with the HDI (income, education, health), not GDP alone.
• Evaluate globalisation with its winners and losers (growth and choice versus inequality and instability).