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1823
ANALYZING INDONESIA’S INFLATION IN 1998-2020: ERROR
CORRECTION MODEL APPROACH
Shaila Farizqiyah
*
, Indah Yuliana
State Islamic University of Maulana Malik Ibrahim, Malang, East Java, Indonesia
*
shaila.farizqiyah@gmail.com
ARTICLE INFO
ABSTRACT
Published: October 30
th
, 2022
Inflation is a macroeconomic problem that is of concern, unstable inflation
has a negative impact on people's welfare, so inflation control is important.
The purpose of this study is to estimate the factors that influence inflation in
Indonesia for the period 1998-2020. The research method uses descriptive
analysis by providing an overview of the development of inflation, interest
rates, exchange rates, household consumption, and GDP in Indonesia
during 1998-2020. Quantitative analysis using Error Correction Model
(ECM). This study uses secondary data from the Central Statistics Agency
(BPS) and Bank Indonesia (BI). The results obtained indicate that all
variables (interest rates, exchange rates, household consumption and GDP)
simultaneously have a significant effect on inflation, both in the long and
short term. Based on the results of the partial test, the interest rate variable
has a positive and significant effect on inflation in Indonesia both in the long
and short term. The exchange rate variable partially has a negative and
significant effect on inflation in Indonesia, both in the long and short term.
Furthermore, the GDP variable partially has a positive and significant
effect on inflation in the long term but not significant in the short term.
Meanwhile, the household consumption variable partially has no significant
effect on inflation in Indonesia during the 1998-2020 period.
Keywords: inflation, welfare,
interest rate
This work is licensed under CC
BY-SA 4.0
INTRODUCTION
The economy of a country can be seen from various macroeconomic indicators. These
macroeconomic indicators include exchange rates, economic growth, trade balance deficit and
inflation (Indonesia’s National Development Planning Agency, 2021). Inflation is an interesting
economic phenomenon to discuss, especially with regard to its broad impact on macroeconomic
aggregates. Inflation is also a problem that every economy faces. The extent to which this problem
is bad differs from one time to another, and differs from country to country. Of the various
macroeconomic indicators, inflation is one of the important indicators for a country's economy.
Inflation has a considerable influence on the achievement of several macroeconomic policy
objectives, such as economic growth, employment opportunities, income distribution and balance
of payments. In addition, inflation can create an economic dilemma in every country.
Inflation can be caused by monetary and nonmoneter factors (Gunawan, 1991). Furthermore,
the view of inflation was refined by the emergence of the theory of expectations, which revealed
that economic actors form expectations of the inflation rate based on adaptive expectations and
rational expectations. Figure 1 shows the development of inflation and economic growth from
1998-2020 in Indonesia.
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Figure 1. Inflation Development and Economic Growth Rate in 1998-2020 in Indonesia
Source: Bank Indonesia, 2021 (Processed)
Inflation is one of the important macroeconomic issues to control. The importance of
controlling inflation is based on the consideration that high and unstable inflation has a negative
impact on people's welfare (Endri, 2008). So the author is interested in conducting research on
how the inflation rate in Indonesia is with the title: "Analysis of the Inflation Rate in Indonesia in
1998-2020 (Error Correction Model Approach)".
Given that there are so many factors determining inflation in a country, it is necessary to
identify the source of inflation in Indonesia. So that the formulation of the problems in this study
is how fluctuations in inflation, interest rates, exchange rates, household consumption and Gross
Domestic Product (GDP) in Indonesia for the 1998-2020 period, what factors affect inflation
fluctuations in Indonesia during the 1998-2020 period and how the implications of government
policies for inflation stabilization in Indonesia.
The purpose of this study is the first to analyze the development of inflation, interest rates,
exchange rates, household consumption and Gross Domestic Product (GDP) in Indonesia for the
period 1998-2020 (Novita & Herianingrum, 2020). Second, to estimate and analyze what factors
affect inflation fluctuations in Indonesia during the 1998-2020 period. Third, to analyze the
implications of government policies for inflation stabilization in Indonesia.
Effect of Interest Rates on Inflation
The relationship between interest rates and inflation is in line with the factual condition that
the variable interest rate used in this study is the policy rate of Bank Indonesia. Thus, the
relationship between inflation as the final target of monetary policy and interest rates as the
operational target of monetary policy should be strong. This is also in line with Juhro's opinion
(2021) which states that monetary policy seeks to influence aggregate demand to achieve goals,
namely the inflation rate using interest rates. Changes in interest rates will affect the cost of capital
which in turn will affect investment expenditure and consumption which are components of
aggregate demand.
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A positive relationship can be explained using the logic of this regression equation, namely
that if the policy rate rises, then inflation will rise and vice versa if the policy rate falls, inflation
will fall. This is because the unidirectional relationship in this regression equation is the indented
variable and its effect on the independent variable. In the facts on the ground, as Juhro argued
above, Bank Indonesia will respond to current and future inflation developments. If inflationary
pressures increase now and in the future, Bank Indonesia will raise the policy rate to dampen the
inflation rate. Similarly, it will lower interest rates whenever inflationary pressures are reduced.
The results of this study are in line with the results of research by Andrianus and Niko (2006)
which show that interest rates have a significant effect on inflation. Also the results of the research
of Langi et al. (2014) which also uses the ECM model shows that Bank Indonesia's interest rate in
the short term has a positive and significant relationship to changes in the percentage of the
inflation rate. However, from the results of Soleh's research (2013) there is a different direction,
namely showing that interest rates have a negative and significant effect on inflation.
Effect of Exchange Rate on Inflation
For the long-term relationship between the exchange rate and inflation, it can be explained
that the nominal movement of the exchange rate (nominal) has increased or depressed since 1998-
2020. On the other hand, inflation in Indonesia tends to decline. This is due to the normal world
oil price and other major world commodity prices, inflation in Indonesia tends to show a downward
trend. On the contrary, the rupiah exchange rate against the US Dollar nominally tends to increase,
from time to time. With such movements in exchange rate and inflation data, then the coefficient
of the equation will show negative signs. The results of Listiani's (2006) research as well as
Andrianus and Niko (2006) also concluded that the exchange rate negatively affects inflation.
However, the results of this study are not in line with the results of research conducted by Loungani
and Swagel (2000) which states that developing countries with a free-floating exchange rate
system, the influence of expansionary policies both through the money supply and exchange rate
depreciation encourages an increase in inflation and the impact is significant.
In the short term, the exchange rate also has a negative but not significant relationship to
inflation, it can be explained that short-term exchange rate fluctuations are indeed very dynamic,
and this exchange rate movement is not all transmitted by an increase in the domestic price level.
The existence of a negative relationship is due to factors outside the exchange rate being more
dominant in the formation of the inflation rate, for example, the increase in fuel prices, food prices,
electricity tariffs, transportation tariffs and so on.
Effect of Home Consumption Tano p Inflation
The results of quantitative research show that household consumption has no significant
effect on inflation can be attributed to the results of a descriptive analysis, namely that the inflation
trend throughout 1998-2020 tends to decrease. On the other hand, Household Consumption other
than in 1998 and 2020, tends to have stable growth (Martanto et al., 2021).
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The Effect of GDP on Inflation
The results of quantitative research that show GDP only has a significant effect in the long
term on inflation, can be attributed to seeing the results of a descriptive analysis that the inflation
trend throughout 1998-2020 tends to decrease. On the other hand, GDP tends to be stable in
growth, in addition to 1998 and 2020. The data on GDP in 1998 and 2020, which contracted quite
deeply, are likely to affect the condition of the relationship between these two variables. Therefore
in short-term relationships it becomes unconstitutional (Priyono, 2016).
Policy Implications
To re-quote Milton Friedman's statement, "Inflation is always and everywhere phenomena",
shows its relevance in Indonesia, because from the research period of 1998-2020, inflation on an
annual basis continued to appear, high and fluctuating. However, indeed in the last 6 years inflation
in Indonesia has begun to show a decline and is relatively low (Listika et al., 2019).
From the results of the descriptive analysis, it can be identified the causes of inflation in the
research data range, namely 1998-2020, namely that fluctuations and high inflation mainly occur
during times when there is a shock in fuel price increases. Next, if there is a decrease in fuel prices,
inflation tends to fall. Seasonally, the National Religious Holidays period can also drive inflation
up, due to an increase in public demand. The results of the quantitative analysis identified the
influence of variable interest rates, exchange rates, household consumption and GDP on inflation
in Indonesia.
Monetary Policy
Monetary policy can be said to be the spearhead in controlling inflation from the demand
side (Haryono et al., 2003). In this case, Bank Indonesia influences the demand for public money
by raising or lowering interest rates. This increase in interest rates will affect people's choice to
keep money in the bank or use it for investment. Investment will increase aggregate demand. In
relation to inflation, when there is high inflationary pressure, Bank Indonesia will raise interest
rates and will reduce investment and ultimately reduce aggregate demand, which in turn will
reduce inflationary pressures.
Fiscal Policy
As Nopirin (1997) defines fiscal policy related to inflation, fiscal policy is a policy that
concerns the regulation of government spending and taxation that can directly affect total demand
and thus affect prices. This condition can trigger the ineffectiveness of the policies taken, because
efforts to encourage high economic growth will have an impact on inflation.
METHOD
The analytical methods used in this study are qualitative and quantitative descriptive
analysis. The descriptive analysis method aims to provide a description or overview of
developments regarding inflation, interest rates, exchange rates, household consumption, and GDP
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in Indonesia in 1998-2020. Meanwhile, quantitative analysis is used to see how the influence of
free variables (Interest Rate, Exchange Rate, Household Consumption and GDP) on bound
variables, namely Inflation.
The type of data used in this study is secondary data that is quantitative. The main data in
this study are inflation, BI policy rate, exchange rate in Indonesia, household consumption in
Indonesia and gross domestic product. The data is sourced from the Central Statistics Agency
(BPS) and Bank Indonesia (BI). In addition, the supporting data of this research also comes from
various national and international journals.
To answer the problem in this study, namely by using the Error Corection Model (ECM).
This model is taken because it can see and analyze short-term and long-term relationships the
influence of independent variables on dependent variables. In addition, ECM is able to correct
short-term imbalances towards long-term equilibrium and is also able to explain the influence
between independent variables on dependent variables in the present and past times by using time
series data or non-stationary time series. This analysis uses the help of Eviews 8 with the aim of
determining the influence of independent variables on their dependent variables.
The model equation is as follows:
INF = f (SB, KURS, KONS, PDB)
INF= Inflation
SB = Interest Rate (Bank Indonesia policy rate)
KURS = Rupiah Exchange Rate per US dollar
KONS= Household Consumption
GDP= Gross Domestic Product
RESULT AND DISCUSSION
Long-Term Regression
The Ordinary Least Square model is carried out to determine the impact of interest-rate-free
variables, exchange rate, Household Consumption, and GDP against inflation-bound variables in
the long term. The following are the results of long-term estimates of free variables against
inflation in the period 1998 to 2020, as shown in table 1.
Table 1. Long-term estimation output
Dependent Variable: INF
Method: Least Squares
Included Observations: 23
Variable
Coefficient
Standard Error
t-Statistic
Prob.
C
-135.5740
115.3711
-1.175113
0.2553
SB
2.788165
0.190195
14.65952
0.0000
LOG(KURS)
-18.64807
9.599796
-1.942549
0.0679
LOG(KONS)
-86.19925
65.30581
-1.319932
0.2034
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LOG(PDB)
101.6419
54.51307
1.864542
0.0786
R-squared
0.941401
9.412174
Adjusted R-squared
0.928379
15.33957
S.E. of regression
4.105184
5.852038
Sum squared resid
303.3456
6.098885
Log likelihood
-62.29844
5.914119
F-statistic
72.29336
1.355356
Prob(F-statistic)
0.000000
Source: Data Processed, 2021
Then the model obtained is:
INF
t
= β
0
+ β
1
SB
t
+ β
2
log(KURS)
t
+ β
3
log(KONS)
t
+ β
4
log(PDB)
t
+ ɛ
t
INF
t
= -135,5740 + 2,788165SB
t
- 18,64807log(KURS)
t
- 86,19925log(KONS)
t
+ 101,6419log(PDB)
t
+ ei
(0,0000) (0,0676) (0,2034) (0,0786)
F-statistic = 72,29336; F-probability = 0,000000; R
2
= 0, 941401
In the long run the probability for the exchange rate variable of 0.0679 is significant at a
confidence level of 10%, GDP of 0.00786 is significant at a confidence level of 10%, and SB of
0.0000 is significant at a confidence level of 5%, while for probability of a KONS variable of
0.2034 means insignificant. The exchange rate coefficient has a statistically significant effect and
has a negative sign. The value of the variable exchange rate coefficient is -18.64807, indicating
that there is a negative influence between the exchange rate variables on inflation. It means that if
the exchange rate rises (depreciates) by 1%, Indonesia's inflation will decrease by 18.64807
percent assuming other variables remain.
The SB coefficient has a statistically significant effect and has a positive sign. The value of
the SB variable coefficient is 2.788165. This shows that there is a positive influence between the
variable interest rates on inflation. This means that if the interest rate rises by 1 percent, Indonesia's
inflation will increase by 2.788165 percent assuming other variables remain.
The SB coefficient has a statistically significant effect and has a positive sign. The value of
the SB variable coefficient is 2.788165. This shows that there is a positive influence between the
variable interest rates on inflation. This means that if the interest rate rises by 1 percent, Indonesia's
inflation will increase by 2.788165 percent assuming other variables remain.
Next, the GDP coefficient has a significant effect and has a positive influence with the value
of the variable coefficient of GDP being 101.6419. This shows that there is a positive influence
between the variables of GDP on Inflation. This means that if GDP increases by 1 percent,
Indonesia's inflation will increase by 101.6419 percent assuming other variables remain.
Meanwhile, the coefficient of cons has no statistically significant effect and has a negative sign.
The value of the cons variable coefficient is -86.19925.
After previously testing the requirements to determine the estimation model, it is known that
the data is stationary at the first difference level and cointegration occurs, the model should use an
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ECM estimate. After regressing free variables to bound variables, the next step is to look at the
value of the root units of the residual or Error Correction Term (ECT) of the regression equation.
Table 3. Root Unit Test Results against Residual Regression Equations
Null Hypothesis: RES has a unit root
Lag Length: 1 (Automatic based on SIC, maxlag=4)
t-Statistic
Prob.*
Augmented Dickey-Fuller test statistic
-3.420390
0.0218
Test critical values:
1% level
-3.788030
5% level
-3.012363
10% level
-2.646119
*MacKinnon (1996) one-sided p-values.
Source: Data Processed, 2021
From table 3, it can be seen that the test results of the root test unit of the residual regression
equation are significant at the first difference level, it can be seen that the probability value is less
than the signification rate of 5%. Thus the results of the stationaryness test against residuals are
further strengthened that against the data used there is cointegration at the level level.
Short-Term Regression (ECM)
ECM is used to determine the effect of free variables on short-term bound variables and their
quick adjustment to return to their long-term balance of time series data for variables that have
cointegration. The following is a table of ECM model regression results:
Table 5. ECM Model Regression Results (Short Term)
Dependent variable: D (INF)
Included Observations: 22 after adjustments
Variable
Coefficient
Std. Error
t-Statistic
Prob.
C
-0.190944
2.695328
-0.070843
0.9444
D(SB)
2.915832
0.254828
11.44237
0.0000
D(LOG(KURS))
-19.93933
9.225721
-2.161276
0.0462
D(LOG(KONS))
-102.2551
97.37922
-1.050071
0.3093
D(LOG(PDB))
121.4591
100.9522
1.203135
0.2464
RES(-1)
-0.687986
0.233556
-2.945704
0.0095
R-squared
0.958289
Mean dependent var
-3.448182
Adjusted R-squared
0.945255
S.D. dependent var
16.79582
S.E. of regression
3.929842
Akaike info criterion
5.802077
Sum squared resid
247.0986
Schwarz criterion
6.099634
Log likelihood
-57.82284
Hannan-Quinn criter.
5.872172
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F-statistic
73.51874
Durbin-Watson stat
1.584830
Prob(F-statistic)
0.000000
Source: Data Processed, 2021.
The models obtained are:
INF
t
0
+β1D(SB)t+β2D(log(KURS))
t
+β3D(log(KONS))
t
+β4D(log(PDB))
t
+β4RES(-1)
+
ɛ
t.
INF
t
= -0,190944 + 2,915832D(SB)
t
- 19,93933D(log(KURS))
t
-102,2551D(log(KONS))
t
+ 121,4591D(log(PDB)
t
-
0,687986RES(-1)
+
ei
(0,0000) (0,0462) (0,3093) (0,2464)
F-statistic = 73,51874; F-probability = 0,000000; R
2
= 0,958289
From the results of the estimates in the table above, in the short term the probability for the
SB and KURS variables is significant at a confidence level of 5%. Whereas the variables KONS
and GDP for the short term are not significant at both 5% and 10% confidence levels.
A statistically significant RES(-1) value means that the specific model used is valid. A RES(-
1) coefficient value of -0.687986 indicates that short-term equilibrium fluctuations will be
corrected towards a long-term equilibrium. This means that based on the speed of adjustment, there
is a 69% imbalance in the short-term effect of the variables Interest Rate, Exchange Rate,
Household Consumption and GDP on the variable Inflation. The SB (Interest Rate) change
coefficient has a statistically significant effect and has a positive sign. The value of the variable
coefficient of interest rates is 2.915832, indicating that there is a positive influence between the
variables of interest rates on inflation. That is, if the Interest Rate rises by 1 percent then inflation
increases by 2.915832 percent assuming other variables remain.
The exchange rate change coefficient has a statistically significant effect and has a negative
sign. The value of the KURS (Exchange rate) variable coefficient is -19.93933, indicating that
there is a negative influence between the KURS variables on inflation. That is, if the KURS rises
by 1 percent (or depreciation) then inflation decreases by 19.93933 percent assuming other
variables remain. The coefficient of change in KONS (Household Consumption) and GDP (Gross
Domestic Product) has an insignificant effect statistically (5% and 10%).
Hypothesis Test
This hypothesis test is used to determine the effect of interest rates, exchange rates,
household consumption, GDP on Indonesia's inflation both partially and simultaneously.
Coefficient of Determination (R
2
)
The coefficient of determination in the long term is obtained by a figure of 0.941401,
meaning that the contribution of all free variables in explaining bound variables by 94.14% and
the remaining 5.86% is explained by other variables outside the model. Meanwhile, in the short
term, a figure of 0.958289 was obtained, which shows that the contribution of all free variables in
explaining inflation-bound variables of 95.83% and the remaining 4.17% is explained by other
variables outside the model.
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Simultaneous Significance Test (F Test)
Based on the results of the analysis using the Eviews 8 software, in the long term a probability
value of F of 0.000000 is obtained and similarly in the short term a probability value of F of 0.0000
is obtained in a significant level of 5%, the F test can be concluded that in the long term and in the
short term all variables both Interest Rate, Exchange Rate, Household Consumption, and GDP
together have a significant effect on the bound variable, namely Inflation.
Partial Significance Test (T-test)
The results of the partial test analysis (Test t) in the long term showed that the variables free
of Interest Rates, Exchange Rates and GDP individually had a significant effect on inflation at a
confidence level of 10% (except SB 5%). The partial test in the short term shows that the variables
of interest rates and exchange rates have a significant effect on inflation at signification levels of
5% and 10%, respectively.
The results of the analysis of the Interest Rate variable show that in the long term this variable
has a coefficient of 2.788165 and a probability of 0.0000, while in the short term it has a coefficient
of 2.915832 and a probability of 0.0000. In a significant degree of 5%, the variable interest rate
has a significant and positive effect on inflation both in the long and short term.
Furthermore, the results of the analysis show that the exchange rate variable in the long term
has a coefficient of -18.64807 and a probability of 0.0679, while in the short term it has a
coefficient of 19.93933 and a probability of 0.0462. In a significant degree of 10%, the exchange
rate variable is significant and negatively affects inflation both in the long term and in the short
term.
The analysis of the Household Consumption variable shows that in the long term this variable
has a coefficient of -86.19925 and a probability of 0.2034, while in the short term it has a
coefficient of -102.2551 and a probability of 0.3093. In the 5% significance level, the variable
household consumption both in the long term and in the short term does not have a significant
effect on inflation.
Finally, the GDP variable in the long term has a coefficient of 101.6419 and a probability of
0.07686, while in the short term it has a coefficient of 121.4591 and a probability of 0.2464. In the
level of significance of 10%, the GDP variable has a significant and positive effect on inflation in
the long term, but has an insignificant effect on inflation in the short term.
CONCLUSION
During the 1998-2020 period, Indonesia's economic condition as seen from the variables of
inflation, interest rates, exchange rates, household consumption and GDP tended to fluctuate. Such
fluctuations are mainly due to internal and external factors. External factors tend to have a strong
impact on the Indonesian economy, especially during the monetary crisis in Southeast Asia 1997-
1998 and the global financial crisis in 2008. During the 1997-1998 crisis, inflation was relatively
high, caused, among other things, by deep exchange rate depreciation. High inflation has prompted
Bank Indonesia to implement a tight monetary policy by raising interest rates that are relatively
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high. The combination of these further makes household consumption and GDP contract. As for
the global financial crisis in 2008-2009, economic conditions were not as bad as during the 1997-
1998 crisis. Inflation and interest rates have increased and the exchange rate has also depreciated.
Nevertheless, household consumption and GDP can still grow quite well.
Based on the results of testing the inflation rate in Indonesia during the period 1998-2020
using the ECM method, the results were obtained, that simultaneously in both the long and short
term, the variables of interest rates, exchange rates, household consumption and GDP had a
significant effect on inflation. Meanwhile, based on the results of partial testing both in the long
and short term, variable interest rates have a positive and significant effect on inflation in
Indonesia. Partial exchange rate variables in the long term and in the short term had a negative and
significant effect on inflation in Indonesia in the 1998-2020 period. Furthermore, the GDP variable
partially has a positive and significant effect on inflation in the long term but not significantly in
the short term. Meanwhile, the variable of partial household consumption has no significant effect
in the long and short term on inflation in Indonesia during the 1998-2020 period.
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