inflation shows a rising trend due to world oil prices
reaching 9.2 percent so the inflation trend reaches
11.06 percent and experienced a significant
economic slowdown of 6.01 percent. At the same
time, BI emphasized the interest rate (BI Rate) was
much lower, emphasizing interest rates would have
an impact on increasing the money supply (Pohan,
2008). But from the post-global crisis BI focused its
financial performance so that the economic crisis
could subside which was done by emphasizing the
price of oil to be cheaper and sharp enough to lower
oil prices so that inflation could subside around 2.78
percent so that the inflation trend declined and
returned within the target range the country
especially Indonesia to emphasize lower interest
rates and improve economic growth towards a
positive direction.
The decline in domestic inflation, in theory is
very much responded by the public to reduce the
price of commodity goods, the world of work to
increase employment and reduce unemployment,
and rising economic growth towards a positive
direction for the welfare of society. Likewise, the
trend in the interest rate in 2010 began to decline
due to appreciation in the rupiah exchange rate
appreciation, but JUB continued to show
improvement. The rupiah exchange rate during the
2011-2012 period has weakened to depreciate
against the US dollar, as shown in Figure 1.2 (a) is
inflation, interest rates, and gross domestic product)
where the same year inflation, interest rates indicate
a decline and economic growth also slowed by 6.11
percent, seen from Figure 1.2 (a) is inflation, interest
rates, and gross domestic product) so trend inflation,
interest rates, and economic growth intersect with
JUB in fact increase as in Figure 1.2 (b) is money
supply and commodity exports of non-oil and gas).
Seeing the condition of the rupiah exchange rate
increase, exports of goods will also increase abroad.
The export price of the goods tends to be cheap
compared to the prices of domestic goods, which
causes the supply of goods both domestic and
foreign to increase, in turn, will reduce the price of
the goods so that the CPI must be able to be
controlled with the target can help the inflation
process towards lower long term. And it is seen that
the inflation trend in 2012 has slightly increased, this
indicates that a significant increase in JUB can cause
the inflation rate to rise.
2 THEORICAL FRAMEWORK
2.1. Rupiah Exchange Rate Volatility
Overshooting exchange rates can occur when
exchange rates adjust faster than goods and services.
Dornbusch treats the exchange rate as a jump
variable where the exchange rate adjusts quickly to
the disruption of the economy, while other variables
such as output, price, and interest rates are in
adjustment to be slow to barely move. Dornbusch
extends the version of the perfect capital mobility
from Mundel-Fleming. Dornbusch includes
exchange rate expectations to explain volatility in
exchange rates and include dynamic elements
(Dornbusch, 1980).
The characteristics of the Dornbusch model are
sticky prices in the short term. Overshooting the
model involves the process of adjusting in exchange
rates and immovable prices at the same speed level.
Suppose there is a monetary expansion. Short-term
expansion of monetary policy causes interest rates to
fall. This reduction in interest rates immediately
pushes adjustments in exchange rates but prices
adjust gradually. In response to a shock to the
economy, the exchange rate will be overshooting the
level of balance. First of all the exchange rate will
move to a level above the balance then it will
gradually return to the long-term balance.
2.2. Macroeconomic Variables
Macroeconomics is a branch of economics that
studies the phenomenon of economic indicators in
aggregate or whole, for example economic growth,
unemployment, inflation, interest rates, circulation
of money in an economy. Macroeconomic
explanations include economic changes that affect
all households, companies, and markets simultan
(Mankiw, 2004: 500). And there are also four keys
in the macro market, namely (1) natural resources,
(2) exports of goods and services or commodities,
(3) loanable funds, and (4) foreign exchange
(exchange rates) (Sobel, 2009).
Inflation
Inflation is one indicator of macroeconomic
variables in analyzing the economy of a country,
especially related to the broad impact on aggregate
macroeconomic variables. According to Lerner
(Gunawan, 1995), inflation is a situation where there
is an excess demand for goods and services as a
whole. According to Keynesian theory, inflation is
an excess of money supply compared to demand and
without expansion of money supply, excess
aggregate demand can occur if the increase in
consumption expenditure, investment, government
expenditure, and exports, thus inflation can be
caused by monetary and non-monetary factors
(Gunawan, 1995).