Principles of Macroeconomics / Unit 13 MAC 1222 review, 2 to 3 minutes
Why a Strong Currency Is Not Good News for Everyone
The idea
The language works against understanding here, and it is worth dismantling deliberately. A currency that strengthens is described in the same words used for health, and a currency that weakens in the words used for illness, and neither meaning survives contact with the model. An appreciation is a movement in a price, and like any price movement it helps whoever is buying at that price and hurts whoever is selling. Six groups are affected each time. Exporters at home are hurt, because their goods now cost foreigners more. Residents holding foreign assets are hurt, because those assets convert back into less. Foreign visitors are hurt, because their money goes less far. And the mirror three gain: foreign exporters selling in, who now undercut domestic producers; residents travelling abroad, whose money goes further; and foreigners holding domestic assets, which are now worth more to them. A depreciation reverses all six exactly.
In practice
Worked example, one movement traced through. A currency appreciates by a quarter against its main partner. Domestic exporters lose orders, because their goods have risen by a quarter in the buyer's money; some cut output and some cut employment. Domestic buyers of imports gain, because foreign goods have fallen by a fifth in their money, and households buying them are better off in real terms. Net exports fall, which shifts aggregate demand left, so output falls and the price level falls a little, which is contractionary. Set against that, cheaper imported inputs lower costs for domestic producers who use them, which pushes short-run supply the other way. The net result depends on how much of the economy exports and how much imports, and the model does not decide that for you.
Where people slip
Three cautions. First, the danger in exchange rates is usually not the level but the speed: a large fast move breaks the currency mismatch of any bank that borrowed abroad and lent at home, and when several large banks fail together a currency problem becomes a recession. That has happened in more than one region, most visibly across East Asia in 1997 and 1998 and again in one South American economy in 2002. Second, every government would prefer a stable rate and may still want a weaker one to fight a recession or a stronger one to fight inflation, so a stated preference for stability is compatible with wanting a move. Third, the six groups do not have equal voice: exporters are concentrated and organised while import buyers are dispersed, so the political account of an appreciation rarely matches the economic one. That asymmetry is a fact about who is heard, not a finding about who is right, and the course reports it as the first and not the second.
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