Floating exchange rates

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What is the impact of macroeconomic policies (↑ or ↑) under a floating exchange rate regime?

Does a temporary shock () have the same effect on the exchange rate as a permanent shock ()?

Can the evolution of the US current account be explained on the basis of the full model (DD-AA)?

Application of the DD-AA model to analyse the effects of fiscal and monetary policies.

Two possible situations :

  1. Floating exchange rates (this chapter)
  2. Fixed exchange rates (next chapter)

We start from a long-term situation where , .

We consider an expansionary shock (↑ of or ). Distinction between:

Temporary shock doesn't change currency expectations (\Delta E^e = 0</math>).

Permanent shock modifies exchange rate expectations (); in this case we also distinguish short-term effects () from long-term effects ().


Floating exchange rates[modifier | modifier le wikicode]

Most developed countries adopt a floating exchange rate regime = the government does not systematically intervene to try to maintain a parity against a base currency → continuous fluctuations.

Source: Feenstra&Taylor, 2008

Case Swiss franc (CHF) - euro (EUR)

Source: Pacific Exchange Rate Service[10]

Model DD-AA: Temporary shocks[modifier | modifier le wikicode]

Politique budgétaire expansive[modifier | modifier le wikicode]

Temporary shocks =>

↗ => DD to the right => given, ED of goods and services => ↗ =>Currency ED => ↗ => ED of national currency => ↘ (ds movement along AA). This until equilibrium is restored in all markets at the point (but with a CA↘ through an appreciation of the national currency).

Économie internationale politique budgétaire expansive 1.png

Expansionary monetary policy[modifier | modifier le wikicode]

Chocs temporaires =>

↗ => AA to the right => to , -> ↘ => -> ↗ = feedback on A’A’ (immediate adaptation), but with CA higher than initially => => ↗ => gradual transition from the point to the point (= partial compensation for the initial depreciation of the national currency).

Finally, at the point the AC improved through the depreciation of the national currency.

Économie internationale politique monétaire expansive 1.png

Policy of maintaining full employment[modifier | modifier le wikicode]


Temporary negative shock : => 1 ⟶ 2 et

How to restore ? Either by:

  • Monetary expansion ()
  • Fiscal expansion ()

Or: combining monetary and fiscal policy

Économie internationale politique politique de maintien de plein emploi 1.png

NB1: Even if the effect of these two interventions on output is identical, monetary policy and fiscal policy are not equivalent in their impact on the exchange rate.

NB2: What interventions can be imagined to counteract the recessionary effect of a temporary increase in the demand for money?

Remarks on stabilization policies[modifier | modifier le wikicode]

The short-term impact of macroeconomic policies may not occur at the desired time (the problem of timing, which affects fiscal policy more strongly).

Increasing government deficit as a result of an expansive fiscal policy weighs on future generations.

Risk that macroeconomic policy may be recuperated for political purposes (expansive policy just before an election): the anticipation of such behaviour may lead to wage demands and price increases = inflationary bias (self-fulfilling expectations) which led to the independence of many central banks in the 1980s.

Model DD-AA: permanent shocks[modifier | modifier le wikicode]

Expansionary fiscal policy[modifier | modifier le wikicode]

The change in the expected exchange rate is based on the relationship :

Économie internationale politique modèle DD-AA politique budgétaire expansive 1.png

As the level of has increased, agents anticipate, in the long term, a real appreciation of % necessary to restore equilibrium in the goods and services market.

Anticipated nominal exchange rate appreciates (same proportion): and the rise in domestic demand (due to ↑) is compensated by a ↓ pf CA.

AA moves downwards by a proportion vertically to full employment income ( by hypothesis): role of anticipations.

Simultaneous changes => one passes immediately from the point to the point .

Nominal appreciation of % (greater than in the case of a temporary expansion: point which maintains the economy at its full employment level.

Économie internationale politique modèle DD-AA politique budgétaire expansive 2.png

No impact on national income (not even in the short term). N.B.: Here ( only with monetary shock).

Pexpansive monetary policy[modifier | modifier le wikicode]

Agents anticipate that, in the long term, an increase in the money supply of % will be reflected in the same proportion on and on : role of expectations.

Économie internationale politique modèle DD-AA politique monétaire expansive 1.png

In the short term:

  • ↑ de %, which moves AA upward in the same proportion (vertical to full employment income) -> ( -> ).
  • Also, like ↑ => further movement of AA to the right -> ( -> ).
  • In  : -> ↓ => ↓ ( -> ).

=> impact on (↑) even more pronounced than if the shock is temporary (point ).

Économie internationale politique modèle DD-AA politique monétaire expansive 2.png

Gradual price adjustment

As and has risen, prices gradually increase until the economy returns to full employment () or ().

= DD and AA curves move left until they intersect vertically from (full employment) to the point .

=> No real long-term consequences ( , and all increase in the same proportion):

Exchange rate overshooting

Summary: Floating exchange rates[modifier | modifier le wikicode]

Économie internationale politique résumé changes flottants 1.png

IS-LM model with floating exchange[modifier | modifier le wikicode]

Equilibrium[modifier | modifier le wikicode]

Économie internationale IS-LM avec changes flottants équilibre 1.png

NB: the IS-LM model is a short-term model which is not adapted to capture the long-term effects of an economic policy => in the following we will analyse only the impacts of temporary policies (cf. FT, ch7).

Currency budget shock[modifier | modifier le wikicode]

Économie internationale IS-LM avec changes flottants choc monétaire temporaire 1.png

Temporary budget shock[modifier | modifier le wikicode]

Économie internationale IS-LM avec changes flottants choc budgétaire temporaire 2.png

Case Study: The United States Current Account[modifier | modifier le wikicode]

US current account 1976-2004[modifier | modifier le wikicode]

Over the whole period, the real exchange rate and the US current account balance seem to follow a cyclical pattern. = the dollar really appreciates before 1985 and before 2002 (NB: in this graph a rise in the real exchange rate indicates a real appreciation of the dollar), while CA follows the opposite trend.

Économie internationale compte courant des États-Unis compte courant 1976-2004 1.png

Can the DD-AA model (KO, ch.17) explain these developments?

Explanation[modifier | modifier le wikicode]

DD-AA model and expansive fiscal policy: as just seen above, under the DD-AA model an expansive fiscal policy leads to a real appreciation of the national currency and a current account deficit. This works well with the early 1980s and early 2000s: the two governments involved (Reagan or Bush junior) both reduced taxes and increased military spending.

What causes the pendulum to swing back?

Suggested KO: wealth effect (not formally incorporated in the DD-AA model) = as the current account deficit widens, the wealth of residents falls relative to that of non-residents (see chapter 10). Since there is a national preference, this should lead to a decline in the relative demand for domestic products, and thus to a real depreciation of the national currency. If the latter is correctly anticipated by agents, this immediately generates a depreciation of the national currency, which gradually corrects the current account deficit.

Puzzles[modifier | modifier le wikicode]

1. As soon as it noticed a fall in industrial production following the crisis caused by the 2000-2001 financial bubble (new technologies), the FED lowered interest rates to mitigate the effects of the recession = expansive monetary policy, which should have led, according to our DD-AA approach, to a depreciation of the dollar. However, the USD continued to appreciate until 2002. Why did it do so? Possible explanation: anticipation of future appreciation of the US currency based on two elements:

  1. Bush, narrowly elected, announces tax cuts = expansive fiscal policy.
  2. The 9/11 attacks would certainly call for an expansive fiscal policy.

2. From 2002 onwards the US dollar started to depreciate considerably. In spite of this, the trade balance continues to remain heavily in deficit and there is no evidence of improvement. Why?

Possible explanation: US domestic consumption too high and savings too low in relation to investments → strong international imbalances (see end of chapter 10).

Conclusion: One must remain cautious in the analysis. There are enough exogenous variables in the model to make it consistent with virtually all macroeconomic developments!

Annexes[modifier | modifier le wikicode]

References[modifier | modifier le wikicode]