Theoretical Economics Letters
Vol.4 No.1(2014), Article ID:42959,6 pages DOI:10.4236/tel.2014.41011

International Crises, Characterization of Contagion and Social Well-Being in Developing Countries: A Theoretical Model

Giscard Assoumou Ella

Department of Economics, University of Toulon, Toulon, France

Email: giscard-assoumou-ella@etud.univ-tln.fr

Received October 14, 2013; revised November 14, 2013; accepted November 21, 2013

ABSTRACT

This paper has two objectives: to characterize the exposure of developing countries to the international income, prices and monetary shocks and to calculate the social well-being in the period of contagion. Firstly, we develop a theoretical model with a world composed of two countries (developed and developing countries) and measure the level of the exposure of income in developing country to the external shocks trough external trade, international tourism, migrant transfers, external debt, foreign aid, FDI and other private financial flow channels. And, we characterize imported inflation in studying the effect of the international shocks on real exchange rate. Secondly, we search the social well-being. The results suggest that economic disequilibrium in developing country is socially optimal and that the dependence of its income to the domestic industry is necessary to reduce contagion. This conclusion is important for African countries because they import finished products for the households’ consumption. In these conditions, they are exposed to the imported inflation. The domestic monetary and tax policies are not adapted to fight against inflation. Also, they produce and export raw materials essentially toward industrialized economies. Thus, they must develop the domestic industry in order to influence the demand (or prices) of raw materials and to substitute imports by domestic goods in period of hyper-inflation in advanced economies in order to reduce imported inflation.

Keywords:International Crises; Social Well-Being; Imported Inflation

1. Introduction

In the history of the contemporary economies, it observes the recurrence of the economic and financial crises in advanced economies that affect developing countries [1-3]. In fact, income in developing countries is determined by the following external variables: exports and imports of goods and services [4-9], international tourism [10-13], migrant transfers [14-17], external debt [18-20], foreign aid [21-24], Foreign Direct Investment (FDI) and other private financial flows [25-30]. However, these external variables are impacted by the international shocks. In addition, African countries, for example, export raw materials toward advanced economies and import finished goods for the household consumption. Thus, they are exposed to the fluctuations of the international prices of raw materials and to the imported inflation.

In these conditions, the objectives of this paper are to characterize the levels of the exposure of income in developing countries to the international income, prices and monetary shocks through exports and imports of goods and services, international tourism, migrant transfers, external debt, foreign aid, FDI and other private financial flows channels, and to characterize the imported inflation through the effect of the external shocks on real exchange rate. The final objective is to study the social well-being in developing countries in period of contagion. Firstly, we calculate the fluctuations of income in developing countries through the effects of international shocks on the external variables and characterize imported inflation. Secondly, we search the best economic situation in developing countries in order to reduce the exposure to the international shocks.

The paper is organized as following: the formalization of the model is subject of Section 2. In the Section 3, we calculate the social well-being.

2. Model Formalization

We develop a model of the exposure of developing countries to the international income, prices and monetary shocks and to the imported inflation, with the following hypothesizes:

H1: the world is composed of two countries: a developing country (B) that exports the raw materials and imports finished goods for the household consumption, and a developed country (A) that imports the raw materials for his industry and exports finished products toward (B) [4,31].

H2: (B) is composed by a sector exposed to the shocks of (A) and the prices of raw materials shocks, and a non-exposed sector (Z). According [8], Z represents the domestic determinants of income in developing country.

H3: there is a significant relationship between income in (B) and external trade variables [4-9], international tourism arrivals [10-13], migrant transfers [14-17], external debt [18-20], foreign aid foreign aid [21-24], Foreign Direct Investment and other private financial flows [25-30].

H4: the income, price and monetary shocks of (A) and the price of raw materials shocks impact the external variables enumerated in H3 [32-39].

Using H1, H2 and H3, the relationship between income in (B) and external variables can be written in this form:

(1)

with and

Y represents the income, X the vector of the foreign variables enumerated in H2, the elasticity of Y with respect to X, the elasticity of Y with respect to Z and t, the time.: In the recent literature review concerning the effects of the variables included in the vector X on the domestic income in developing countries, it is demonstrated that the relationship can be positive or negative. In the case of the imports, for example, they have a positive effect on the domestic income if they are the imports of capital goods for domestic investment [40,41], and the effect is negative concerning the imports of consumption goods [9,42]. In the case of migrant transfers, the effect on the domestic income is ambiguous. There is a positive relationship between these two variables [43-45]. The effect can be negative in taking into account the levels of education of the migrants [46-49].: We suppose that the vector Z has a positive impact on the domestic income in developing countries ([4]).

Using H4, foreign variables of (B) can be written in this form:

(2)

with, , and

represents the income in (A), the inflation in (A), the central Bank’ director interest rate in (A), the world price of a raw material exported by (B), the elasticity of X with respect to, the elasticity of X with respect to, the elasticity of X with respect to and the elasticity of X with respect to. We multiply X by e (the nominal exchange rate) for the conversion in money of (B).: Income in (A) has a positive effect on foreign variables of (B).: The effect of inflation in (A) on some external variables of (B) can be positive or negative. In the case of the migrant transfers, for example, inflation in (A) decreases the purchasing power of the migrants, and therefore their transfers.: The effect of monetary policy in (A) on the external variables of (B) can be positive or negative. An expansive monetary policy that increases income and the demand, for example, can decrease the exports of (A) toward (B) (the exports of (A) are the imports of (B)). On the other hand, this monetary policy can increase the migrant transfers.: The effect of price of raw material on the external variables can be positive or negative. A decrease in this variable reduces the value of the exports of (B) and increases the level of the migrant transfers, for example.

In replacing Equation (2) in (1), we have:

(3)

with, , and.

According (3), income, price and monetary policy shocks in (A) and world price of a raw material exported by (B) shock affect domestic income in (B) through exports and imports of goods and services, international tourism, migrant transfers, external debt, foreign aid, Foreign Direct Investment and other private financial flows channels. This exposure is measured by, , and, the multiplication of the elasticity of Y with respect to X with the elasticity of X with respect to,the elasticity of X with respect to, the elasticity of X with respect to and the elasticity of X with respect to. In these conditions, (B) can measure the level of the exposure of his income according the type of the external shock and the transmission channel. According [31], it is possible to use the Equation (3) in order to characterize imported inflation in (B) through the effect of external shocks to the real exchange rate.

Thus, knowing that

with and p, real exchange rate and inflation in (B)

, we apply the logarithm on Equation (3)

and we have:

(4)

Exposure of (B) to the international shocks decreases real exchange rate. In this context, (B) is exposed to the imported inflation. In the case of African countries, for example, they produce and they export essentially raw materials toward industrialized economies [50]. Also, they import finished goods for the household consumption. In these conditions, they are exposed to the fluctuations of the international prices of the raw materials and to the imported inflation, and the monetary and tax policies are not adapted to fight against inflation. Thus, they must develop domestic industry in order to influence the demand (or prices) of raw materials and to substitute imports by domestic goods in period of imported inflation.

3. Social Well-Being in (B)

The social well-being in (B) represents the situation where his economy stands to the contagion of the negative shocks of (A) and the price of raw material shock. Thus, we calculate the equilibrium (disequilibrium) socially optimal in (B), knowing that total consumption is constrained by total income.

The Hamiltonian of the problem is written as following; with an instantaneous logarithmic utility function and a preference for the present of Ramsey type:

We calculate the first order conditions and we respectively represent the equilibrium (disequilibrium) socially optimal in the cases of the international income, price, monetary shocks in (A) and world price of raw material shock:

(5)

is an indicator that represents the exposure of income in (B) to the income shock in (A). His increase implies that the level of the exposure increases in developing country, and conversely in the case of a decrease. Thus, in period of contagion of an external income shock, the equilibrium in (B) is represented by (5); when the variation of Y consecutive to the variation of equates the elasticity of Y with respect to Z. In this context, a decrease of income in (B) after the contagion of a negative income shock in (A) is sustained by the elasticity of Y with respect to Z. However, this equilibrium isn’t socially optimal because is the good situation for (B) in period of contagion of an external negative income shock, and is preferred in period of contagion of a positive income shock.

(6)

is an indicator that represents the level of the exposure of income in (B) to the price shock in (A). Equation (6) represents the equilibrium in period of contagion but isn’t socially optimal because is preferred if the contagion has a negative impact on income in (B), and in the case where the contagion of the price shock increases income in (B).

(7)

represents the level of the exposure of income in (B) to the monetary shock in (A). As the preceding cases, the equilibrium after the contagion of a monetary shock isn’t socially optimal. is preferred in period of a restrictive monetary policy in (A)

and in period of an expansive monetary policy.

(8)

is the level of the exposure of income in (B) to the price of raw material shock. The equilibrium isn’t also socially optimal. is preferred if decreases and if increases.

4. Conclusion and Political Economic Implications

The objectives of this paper are to characterize the exposure of developing countries to the international income, prices and monetary shocks, and to calculate the social well-being in period of contagion. Thus, we develop the theoretical model with a world composed of two countries: developed and developing countries. The results suggest that income in developing country is exposed to the shocks of developed country and the price of raw material shock through exports and imports of goods and service, international tourism, migrant remittances, foreign debt, foreign aid, Foreign Direct Investment, other private financial flows and real exchange rate channels. Also, economic disequilibrium is social optimal in period of contagion. The dependence to the non-exposed sector is necessary to reduce external exposure.

This conclusion is important for the African countries because they produce and export raw materials essentially. In this context, an international industrial crisis has a big impact on their economies. Also, African countries import finished goods for the household consumption. In these conditions, they are exposed to the imported inflation. The monetary and tax policies aren’t adapted to fight against inflation. If we suppose that Z includes domestic industry, for example, the development of this industry in African countries is a good opportunity for them to influence the demand (or prices) of raw materials and to substitute imports by domestic goods in period of imported inflation.

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