and other levies will affect the supply side (Khaldun
1993). The theory was inspired by the phenomenon
of rising and falling demand and supply that differed
between city and village residents. Ibn Khaldun
states, if a city is growing rapidly, its economy is
progressing and its population is crowded, then the
supply of staple food is abundant so the supply
increases which results in the cheap price of the staple
goods. So that the phenomenon that occurs is that
staple goods in the city tend to be cheaper, because of
excess inventory (Khaldun 1993).
While luxury goods will experience an increase, it
can be assessed by the theory of demand and supply.
The theory of supply and demand in modern
economic studies is mentioned as an increase in
disposable income among the urban population. In
urban areas often experience excess income so that it
will increase the marginal propensity to consume (the
marginal tendency to consume) of luxury goods. So
as to create new demand. Luxury goods tend to
increase (E. Amalia 2010).
Another factor that is the cause of rising prices for
goods is because of high production costs due to
customs tariffs, taxes and other levies imposed by the
government on goods (Khaldun 1993). Ibn Khaldun
also highlighted the increase in the price of goods
caused by the existence of behavior} ihtika>r or
hoarding by unscrupulous traders (Khaldun 1993).
Another factor that influences the increase in the price
of goods is the cost of distribution. Goods obtained
from areas that are far away will be more expensive
compared to goods produced from local areas. If the
distribution costs are not expensive then the goods
will also be cheap (Khaldun 1993).
According to Ibn Khaldun the price of goods
greatly affects trade. Fair prices are very necessary for
the continuity of trade. Producers will reduce the
production of goods if the selling price is too low,
while prices that are too high will result in low
consumer interest in buying goods. it will cause the
market to become sluggish (Khaldun 1993). This is
where the importance of fair prices in business.
Government oversight is needed to create fair prices
in the community. Not being freed to be wild or
restrained from being bound, but controlled and
supervised. The ruler must be able to accommodate
the interests of producers to obtain reasonable profits
and the interests of consumers to get a fair price.
To prove his theory, Ibn Khaldun gave an
example in the field of agriculture. If the prices of
agricultural products are cheap, it will have a negative
impact on the lives of many parties, ranging from
farmers, rice cultivators, farm laborers, agricultural
processors to the authorities. Farmers will bankrupt
because they do not have profits due to low harvest
prices, even farmers will increase working capital for
the next planting season. The government will also
suffer losses, because the amount of tax that can be
withdrawn from agriculture will decrease. If the state
income from tax is reduced it will affect development
and affect the welfare of the community (Khaldun
1993).
The life of the farmer described by Ibn Khaldun is
not much different from that of farmers in Indonesia
today. Indonesia must import rice even though
Indonesia is known as an agricultural country. The
economic situation of farmers in Indonesia is not
prosperous. Prices of agricultural products such as
rice, corn and soybeans are very cheap. Production
costs cannot be met from the harvest. So that for the
next planting period our farmers must be in debt
(Sunarti and Khomsin, n.d.). The opposite
phenomenon is deflation. Deflation is the process of
decreasing prices in general and continuously in a
certain period (Mankiw 2006). Deflation will have a
negative impact on economic growth. Economic
activity will slow down due to lack of money supply.
The community will reduce or delay spending so that
the price of goods decreases. In the end the producer
will reduce labor or even terminate the work because
there are no items sold. Deflation will result in a
decline in business sector revenues, a decrease in
income and termination of employment.
Unemployment will increase and investment
decreases (Mankiw 2006). The opposite of deflation
is inflation. Ibn Khaldun also stated that if there was
a high increase in the prices of goods, it would also
damage the economy (Khaldun 1993). In the modern
economy inflation is defined by an increase in the
general price level continuously in a certain period
(Rumapea and Haloho 1994). Samuelson defines
inflation briefly, namely the general price increase
(Samuelson and William 2005). Inflation has a
negative impact on economic growth. Inflation will
reduce income, trade becomes sluggish, production
will decrease because of the increasingly expensive
costs and distribution will also be disrupted because
of the high costs so that investment will decrease and
the level of life and welfare of the people decline
(Mankiw 2006). The negative impact of deflation and
inflation raised by Ibn Khaldun is generally the same
as modern macroeconomic studies. This shows that
Ibn Khaldu's thinking> has preceded all theories of
inflation or deflation.