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.