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Aggregation Across Each Nation: Aggregator Choice and Macroeconomic Dynamics
[Agrégation entre pays : choix d’agrégateur et dynamiques macroéconomiques]

Author

Listed:
  • Lisack Noëmie
  • Sajedi Rana
  • Lloyd Simon

Abstract

We study the implications of trade aggregation in an infinite-horizon economy with multiple countries, asking whether there is a role for alternatives to the Armington aggregator in a wide range of workhorse open-economy macroeconomics models. We show analytically that the first-order dynamics of the model are entirely captured by a few sufficient statistics. Over and above these statistics, the precise choice of functional form for the trade aggregator is irrelevant. This result has the following implications. For given steady-state trade elasticities and expenditure shares, any aggregator that is homogeneous of degree one is equivalent to the Armington aggregator at first order. Similarly, aggregators that are homogeneous of arbitrary degree are equivalent to a simple generalisation of the Armington aggregator, for given steady-state trade elasticities and expenditure shares. In models with more than two countries, alternative aggregators can play a role by allowing for steady-state differences in bilateral trade elasticities across different country pairs, which the Armington aggregator rules out. Nous étudions les implications de l’agrégation entre biens échangeables dans un modèle multi-pays en horizon infini, et si des alternatives à l’agrégateur Armington ont un rôle à jouer dans les modèles typiques de macroéconomie ouverte. Nous montrons analytiquement que les dynamiques de premier ordre du modèle sont entièrement déterminées par un petit nombre de statistiques suffisantes. Au-delà de ces statistiques, le choix précis de la forme fonctionnelle de l’agrégateur du commerce n’a pas d’effet. Ce résultat a les conséquences suivantes. À élasticités de commerce et parts de dépenses à l’état stationnaire données, tout agrégateur homogène de degré 1 est équivalent à l’agrégateur Armington au premier ordre. De même, les agrégateurs homogènes de degré arbitraire sont équivalents à une simple généralisation de l’agrégateur Armington, étant données les élasticités de commerce et parts de dépenses à l’état stationnaire. Dans les modèles avec plus de deux pays, les agrégateurs alternatifs peuvent jouer un rôle en permettant aux élasticités bilatérales de commerce entre différentes paires de pays de prendre des valeurs différentes à l’état stationnaire, ce qui n’est pas possible avec l’agrégateur Armington.

Suggested Citation

  • Lisack Noëmie & Sajedi Rana & Lloyd Simon, 2022. "Aggregation Across Each Nation: Aggregator Choice and Macroeconomic Dynamics [Agrégation entre pays : choix d’agrégateur et dynamiques macroéconomiques]," Working papers 894, Banque de France.
  • Handle: RePEc:bfr:banfra:894
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    References listed on IDEAS

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    1. Rebecca Freeman & Mario Larch & Angelos Theodorakopoulos & Yoto V. Yotov, 2021. "Unlocking New Methods to Estimate Country-Specific Trade Costs and Trade Elasticities," CESifo Working Paper Series 9432, CESifo.

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    More about this item

    Keywords

    International Trade; Open-economy Macroeconomics; Armington Aggregator; Elasticity of Trade;
    All these keywords.

    JEL classification:

    • F00 - International Economics - - General - - - General
    • F10 - International Economics - - Trade - - - General
    • F41 - International Economics - - Macroeconomic Aspects of International Trade and Finance - - - Open Economy Macroeconomics

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