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Assessing the Behaviour of Pakistani Rice Producers under Exchange Rate Variability

SJA_38_1_103-109

Research Article

Assessing the Behaviour of Pakistani Rice Producers under Exchange Rate Variability

Syed Rashid Ali1*, Saad Uddin Khan1 and Ahmed Raza ul Mustafa2

1Department of Economics, University of Karachi, Pakistan; 2Department of Economics, Shaheed Benazir Bhutto University, Nawabshah, Pakistan.

Abstract | This study tries to assess the Pakistani rice producer’s behaviour under the exchange rate volatility. The exchange rate variability is a risk which may force the producers to change their production preferences. The Cobb-Douglas production function used to examine the functional association between exchange rate variability and behaviour of Pakistani rice producers. The Exchange rate volatility is measured through the Moving Average Standard Deviation and time-series data from 1981 to 2018 collected from various sources. This study uses the Johansen Co-integration and Vector error correction model to assess the short run and long run association between the exchange rate variability and rice production in Pakistan. The results confirm that the appreciation in the exchange rate will adversely affect rice production in Pakistan. This negative and significant relationship confirms the risk-averse behaviour of Pakistani rice producers. Parameters stability is checked by the Cusum and Cusumq statistics. Policymakers, when designing policies to promote rice production, should consider the exchange rate volatility.


Received | July 12, 2020; Accepted | May 13, 2021; Published | November 24, 2021

*Correspondence | Syed Rashid Ali, Department of Economic, University of Karachi, Pakistan; Email: rashidali@hotmail.com

Citation | Ali, S.R., S.U. Khan and A.R. Mustafa. 2022. Assessing the behaviour of Pakistani rice producers under exchange rate variability. Sarhad Journal of Agriculture, 38(1): 103-109.

DOI | https://dx.doi.org/10.17582/journal.sja/2022/38.1.103.109

Keywords | Moving average standard deviation, Rice production, Exchange rate volatility, Risk behaviour



Introduction

Rice (Oryza sativa) grown nearly in six continents and is the primary food of half the world population (Chen et al., 2019). Annually, farmers grow around 700 million tons of rice globally over a cultivated area of about 158 million hectares (Childs and Nathan, 2020). Asia alone produces approximately 640 million tons of rice or 90% of global production. The United States Department of Agriculture (USDA) forecasts that in 2019/2020, world rice production will be 499.31 million metric tons, which represents a decrease of 0.06 million tons or 0.01 percent in rice production around the world (Childs and Nathan, 2020).

Rice is an essential crop of Pakistan’s agriculture economy. Pakistan, the tenth-largest rice producer in the world, annually produces in the range of 7.0 to 7.5 million tons (FAO, 2021). Rice is one of the country’s biggest exports earning more than $2.00 billion a year. Pakistan is producing over 5.6 percent of the world’s total rice production. In 2018-19 Pakistan produced 7500,000 metric tons of rice (FAO, 2021).

The volatility of the exchange rate plays a critical role in developing economies because developing or emerging economies are heavily dependent on foreign trade (Abbas et at., 2019). If exchange rate volatility increases, risk-averse agents will limit import/export operations. This increase in risk induce the risk-averse agents to reallocate supply to domestic markets (Yu, 2021). Pakistan is a developing country, and its rice producers have a concern about the variation in exchange rate because Pakistan exports more than 50% of its rice production globally, and the exchange rate risk can create some uncertainty in the profit of Pakistani rice producers (Khan et al., 2019). So, the main aim of this study is to evaluate the behavior of Pakistani rice producer as a risk-averse, risk-neutral or risk lover?

Exchange rate volatility is a risk that arises from unanticipated changes in the exchange rate between two currencies. International trade becomes more difficult as exchange rate volatility increases. There is an immense theoretical as well as empirical literature presenting association between exchange rate variability and foreign trade (Santana-Gallego et al., 2019; Bahmani-Oskooee and Arize, 2020; Bahmani-Oskooee and Saha, 2021). Since the importance of foreign trade is not understood properly, several studies found inconclusive or conflicting conclusions when analysing the nexus between exchange rate variability and foreign trade (Auboin and Ruta, 2013). Some studies found a negative impact (Molina et al., 2013; Bahmani-Oskooee and Gelan, 2018; Sauer and Bohara, 2001) while some studies found positive association (Chi and Cheng, 2016; Bahmani-Oskooee and Saha, 2021) and few studies found no association between exchange rate variability and foreign trade (Nishimura and Hirayama, 2013; Bajo-Rubio et al., 2020).

Due to easily available data of developed countries, early studies used these data of exchange rate variability and foreign trade and analyse the association between these two variables. But several researchers have turned their focus to developing countries after data became available for the developing countries. Table 1 displays some studies from developed and developing countries about the exchange rate variability.

The core objective of this study is to determine how Pakistani rice producers respond when exchange rates fluctuate by taking the time series data from 1981 to 2018. This study is peculiar as it tries to assess the behaviour of rice producers under the variation in the exchange rate. It also analyses the newly available time series data from 1981 to 2018, which enables to investigate the rice production in Pakistan under the exchange rate fluctuation.

Materials and Methods

This study uses the Cobb Douglas production function to assess the behaviour of Pakistani rice producers under exchange rage variability. The Cobb Douglas production function is

The generalized form of the Cobb Douglas production function presented in Equation 5, while the linearized form is in Equation 6.

Where;

ɣ= Rice Production; η= Capital; ω= Exchange Rate; A= Technology level and ln(A)= a0; ln= Log.

In Equation 8, ɣt denotes the per capita rice production, ηt denotes capital-labour ratio, ωt denotes the variability in the exchange rate, sub-script ‘t’ used for the time series and ‘ut’ denotes the error term.

Exchange rate volatility measurement

Over time, various volatility measuring techniques have developed to reflect modern econometric techniques. In the 1980s, many studies tried to use different techniques as an alternative for exchange rate volatility (Cushman, 1983). However, no clear strategy or method has yet emerged to assess the volatility. In the existing literature, various techniques for measuring variability in exchange rate are used. These includes the standard deviation approach (Chowdhury, 1993; Hayakawa and Kimura, 2009; Nishimura and Hirayama, 2013), the moving average of the standard deviation (Arize et al., 2000; Hall et al., 2010), and the Generalized Autoregressive Conditional Heteroskedasticity (GARCH) (Bahmani-Oskooee et al., 2015; Asteriou et al., 2016; Sharma and Pal, 2018).

 

Table 1: Studies of developed and developing countries.

Studies of developed countries

Developed countries

Studies of developing countries

Developing countries

De Vita and Abbott (2004)

The United States

Hall et al. (2010)

Ten EMEs and eleven other developing countries

Arize and Shwiff (1998)

G-7 countries 

Sauer and Bohara (2001)

industrialized and developing countries

Arize (1997)

Denmark, Germany, Italy, Japan, Switzerland, the United Kingdom and the United States

Arize et al. (2000)

13 less developed countries (LDC's)

Chowdhury (1993)

G-7 countries 

Doroodian (1999)

India, South Korea, and Malaysia

Asseery and Peel (1991)

Australia, Japan, United Kingdom, United States and West Germany

Bahmani-Oskooee (1996)

LDCs

Kenen and Rodrik, 1986

Eleven Developed Countries

Bahmani-Oskooee and Ltaifa (1992)

19 developed and 67 developing countries

Akhtar and Hilton (1984)

Germany-United States

Medhora (1990)

Benin, Burkina Faso, Coˆte d'Ivoire, Niger, Senegal, and Togo

Source: Author’s Construction.

 

The use of either a nominal or a real exchange rate differs from study to study in the available literature. Many researchers tend to use the nominal exchange rate because it captures the true relative price as well as the volatility of the traded good. Akhtar and Hilton (1984) used the standard deviation method to measure the frequency of nominal exchange rate observations for each three-month duration.

Hooper and Kohlagen (1978) tried to measure the functional association between exchange rate variability with the prices and volume of traded commodities using alternate exchange rate volatility approaches. This study uses the Moving Average Standard Deviation method for exchange rate variability. This method have already used by studies (Kenen and Rodrik, 1986; Koray and Lastrapes, 1989; Lastrapes and Koray, 1990). It gives flexibility in assessing the magnitude with a span of values. The formula of equating the variation through moving average is:

Here, ‘m’ is the period of the value through which uncertainty is measured. In our case, we have taken it 4. Nominal exchange rate (USA dollar/ Pak Rupees) represented by Et at ‘t’ period, Et-1 is the nominal exchange rate of (USA dollar/ Pak Rupees) at (t-1) period.

Results and Discussion

The annual time series data ranges from 1981 to 2018 has collected from various sources. The source of rice production (ɣ), in Kilo Gram, is the federal bureau of statistics, Pakistan. The other variable’s data, like capital (η) and exchange rate (ω), come from the World Development Indicator and the descriptive statistics presented in Table 2.

 

Table 2: Descriptive statistics.

ɣ

η

ω

Mean

23.41

5.08

5.420

Standard Error

1.04

0.0169

5.509

Median

23.18

5.06

54.49

Standard Deviation

6.42

0.104

33.96

Sample Variance

41.29

0.0109

1153.58

Kurtosis

-1.159

1.460

-0.901

Skewness

0.342

0.562

0.485

Range

20.95

0.572

120.1

Minimum

14.46

4.827

9.9

Maximum

35.42

5.4

130

Sum

889.66

193.14

2059.83

No. of Observation

38

38

38

Source: Author’s Construction.

 

This paper mainly employs the co-integration and Vector Error Correction Model that have previously been employed by others (Koray and Lastrapes, 1989; Lastrapes and Koray, 1990; Asseery and Peel, 1991; Chou, 2000). Initially, the unit root checked for analyzing the trending behaviour of each variable. The Table 3 shows the results of the augmented Dickey and Fuller (1981) test and Philips and Perron (1988) test.

All variables are stationary at the first difference, as shown in Table 2, so the Vector Error Correction Model (VECM) employed for the long run convergent or divergent to the equilibrium. The Table 4 show the lag length criteria obtained by estimating the VAR. The optimal lag length is 1 as confirmed by all methods.

Table 5 highlights the Johansen co-integration result (Johansen, 1988). The trace statistic and Eigen Max statistic both indicate one co-integration equation confirming that variables are co-integrated.

After calculating the Johansen co-integration, then instead of a VAR in level, a vector error correction model that mixes levels and variations can be calculated and check whether VECM outperform the VAR. The results of Vector Error Correction Model presented in Equations 10 and 11, respectively.

In Equation 11, the magnitude and sign of the coefficient of lagged residual (-0.366387) is the primary concern and it is in line with the earlier findings of Moline et al. (2013). It is an adjustment or feedback effect. It is negative and less than 0.5 confirming that the process of adjustment is very slow and converging toward equilibrium.

As all variables are stationary at the first difference, so for short-run and long-run dynamics, the vector error correction model used and the result confirm that exchange rate variability have negative and significant association with rice production in Pakistan. These findings confirm positively with the earlier finding of Akhtar and Hilton (1984), Kennen and Rodrik (1986), Cushman (1983), and opposes the findings of Asseery and Peel (1991), and McKenzie (1999). The result of VECM shows that it will take 10 years for the system to converge towards equilibrium, as presented in Table 6.

 

Table 3: Unit root analysis.

Tests

Augmented dickey-fuller test (ADF)

Phillip-perron test (PP)

Variables

Level

First Difference

Level

First Difference

C

C & T

C

C & T

C

C & T

C

C & T

ɣ

-0.5.2

-4.82**

-9.34*

-9.418*

-0.822

-4.788**

-13.37*

-13.36*

η

-2.467

-3.62**

-4.952*

-4.811*

-1.949

-2.73

-5.06*

-4.915*

ω

-1.949

-2.540

-6.531*

-6.459*

-2.064

-2.557

-6.523*

-6.482*

Note: *, **, *** Present significance at 1% and 5% and 10% levels. Source: Author’s Construction.

 

Table 4: Lag selection criterion (5% significant level).

Lags

LogL

LR

FPE

AIC

SC

HQ

0

183.122

NA

6.80e-09

-10.292

-7.159

-10.246

1

280.029*

171.662*

4.49e-11*

-15.313*

-14.782*

-15.131*

2

285.55

8.838

5.55e-11

-15.117

-14.184

-14.795

3

294.99

13.492

5.559e-11

-15.142

-13.809

-14.682

*Indicates lag order selected by the criterion. Source: Author’s Construction.

 

Table 5: Johansen co-integration test.

Hypothesized No. of CE(s)

Eigenvalue

Trace Statistic

Trace Probabilities

Max-Eigen Statistic

Max-Eigen Probabilities (**)

None*

0.412088

30.54749 (29.79707)

0.0409

19.12240 (21.13162)

0.0933

At Most 1

0.268605

11.42509 (15.49471)

0.1867

11.26083 (14.26460)

0.1416

At Most 2

0.004552

0.164254 (3.841466)

0.6853

0.164254 (3.841466)

0.6853

Note: * Rejection of hypothesis at 0.05 level; ** p-values; Critical values in parentheses. Source: Author’s Construction.

 

Table 6: Variance decomposition of ɣt.

Period

S.E.

ɣt

ηt

ωt

1

0.044756

100.0000

0.000000

0.000000

2

0.048436

98.13124

0.416223

1.722542

3

0.054282

95.67691

2.239666

2.083423

4

0.057904

91.90530

4.529167

3.565529

5

0.062207

87.74326

7.859921

4.396816

6

0.066023

84.19717

10.50038

5.302454

7

0.069836

81.35150

12.73753

5.910968

8

0.073388

79.11101

14.44868

6.440312

9

0.076808

77.32225

15.83163

6.846120

10

0.080059

75.85104

16.95606

7.192892

Source: Author’s Construction.

 

 

The CUSUM and CUSUMQ tests were used to verify the stability of the model, with the findings shown in Figure 1. The results show the stability of the model with a breaking point in 1991 in the intercept term, so the pre and post model presented by using dummy variables. The values of the dummy before 1991 are Zero (0), while the value of dummy after 1991 is one (1).

The estimated results are as follows:

[1.196] [-0.047] [7.813] [0.127]

Pre 1991 model

[1.196] [-0.047] [7.813]

Post-1991 model

[1.3][-0.047] [7.813]

Conclusions and Recommendations

Many studies analyse the relationship between exchange rate variability and foreign trade. This study analyses the behaviour of Pakistani rice producers in the presence of exchange rate volatility by utilising the time series yearly data from 1981 to 2018. For short and long run association among the variables, this study uses Johansen co-integration and Vector Error Correction Models. The findings affirm the negative and significant effect of exchange rate fluctuations on rice production in Pakistan, confirming that a rise in exchange rate variation would negatively affect rice production and confirming Pakistani rice producers’ risk-averse behaviour.

Considering the risk-averse behaviour of Pakistani rice producers, the results of this study proves that variability in exchange rate persuades the Pakistani rice producers to reduce their operations, adjust rates, or move demand-supply sources to reduce the risk of exchange-rate variability. Policymakers, when designing policies to promote rice production, should consider the variability in the exchange rate. There may be some possible limitations in this study as well. This study employed time series data with single country like Pakistan. Researchers may analyse the panel data with more than one countries.

Novelty Statement

This study is the first of its kind to assess the behavior of Pakistani rice producers under exchange rate volatility and put forward significant recommendations to the policymakers. This study confirms a short and long run negative association between exchange rate variability and rice production which further confirms the risk-averse behaviour of Pakistani rice producers under exchange rate variability.

Author’s Contribution

Syed Rashid Ali: Write down the main manuscript, writeup, editing, and final revision.

Saad Uddin Khan: Drafted the outline, Data analysis and technical writing.

Ahmed Raza ul Mustafa: Summarize and supervise the manuscript.

Conflict of interest

The authors have declared no conflict of interest.

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