Based on the results of the Consumer Price Survey of 66 cities in Indonesia in September 2013, it showed that 13 cities experienced inflation and 53 cities experienced deflation. The highest inflation occurred in Sorong Tanjung Pinang 1.70 percent with CPI 147.92 and the lowest in Singkawang 0.04 percent with CPI 147.88. Meanwhile, the highest deflation occurred in Sorong -4.28 percent with CPI 170.68 and the lowest in Surabaya -0.02 percent with CPI 144.19. With inflation of -0.27 percent and CPI 145.62, Mamuju ranked 47th highest out of 53 cities experiencing deflation.
Mamuju experienced calendar year inflation (December 2012 - September 2013) of 5.34 percent and the inflation rate "year on year" (September 2012 - September 2013) of 5.86 percent.
Indonesia in September 2013 experienced inflation of -0.35 percent, with CPI 145.74. The inflation rate of the Indonesian calendar year (December 2012 - September 2013) was 7.57 percent and the inflation rate was "year on year" "(September 2012 - September 2013) of 8.40 percent.
Inflation in Mamuju in September 2013 was mainly due to a decrease in the consumer price index in two expenditure groups, namely: the foodstuffs group -2.23 percent and the transportation, communication and financial services group -0.77 percent. While the other five groups experienced an increase in price index, among others: the health group 3.18 percent, the clothing group 1.05 percent, the housing group, water, electricity, gas and fuel 0.83 percent, the education, recreation and sports group 0, 60 percent, and the processed food, beverages, cigarettes and tobacco group 0.55 percent.
The decline in the price index in the foodstuffs group was caused by a very significant decrease in the price index in the spices sub-group, which was -21.87 percent.
The dominant commodities contributing to inflation were: skipjack tuna 0.10 percent, milkfish 0.09 percent, flying fish and ceramics each 0.08 percent, jewelry gold 0.07 percent, cell phone 0.06 percent, house rates sick, tuna, tempeh and grilled fish respectively 0.04 percent and katamba fish 0.03 percent. Meanwhile, the dominant commodities suppressing the inflation rate were: onion -0.44 percent, inter-city transportation -0.17 percent, garlic -0.13 percent, red chili -0.10 percent, cayenne pepper -0.09 percent, banana -0.07 percent, coconut oil and rice -0.05 percent respectively, chicken eggs and air transportation respectively -0.04 percent, and granulated sugar and vegetable tomatoes -0.03 respectively percent.
