Between April and July 2026, a research team from Universitas Muhammadiyah Mamuju consisting of Matriadi, Yati Heryati, and Ratna conducted an in-depth investigation into the determinants of household income in Karampuang Island, Mamuju Regency, West Sulawesi. This research is highly significant as it explores geographical barriers and residents' absolute reliance on maritime transportation, which directly impacts the economic well-being of coastal communities.
Small island regions frequently face severe economic constraints due to geographic isolation and high logistics costs. Complete reliance on wooden motorboats as the sole connection to the mainland causes residents to bear recurring operational burdens that erode purchasing power and widen income inequality.
This study employed a quantitative approach involving 80 economically active household heads selected through a proportionate stratified sampling method. Data were collected via structured questionnaires and actual monetary measurements, then analyzed using multiple linear regression techniques with statistical software.
Statistical analysis proves that community income variations are jointly influenced by transportation costs, accessibility, and livelihood structures. The main findings of this study include:
- As much as 71.3% of the variation in community income can be explained by the tested regression model ($R^2 = 0.713$, $F = 46.620$, $p < 0.001$).
- Merchant households earn significantly higher monthly net incomes, increasing by IDR 747,600 compared to the farmer or fisherman group.
- Daily laborers experience a significant income deficit, earning IDR 442,300 less than the agricultural baseline group.
- Monthly crossing costs average IDR 263,188 per household, equivalent to 9.41% of total average income.
Matriadi and his fellow researchers from Universitas Muhammadiyah Mamuju emphasize that livelihood disparities are the most dominant determinant of local economic inequality. Policy implications from this study suggest that local governments should immediately implement integrated fuel subsidies for motorboats, upgrade pier and port infrastructure, and establish coastal marketing cooperatives to lower logistics costs and elevate the welfare of island residents.
Author Profiles
- Matriadi – Student at the Development Economics Study Program, Faculty of Economics and Business, Universitas Muhammadiyah Mamuju, Indonesia.
- Yati Heryati – Lecturer at the Department of Development Economics, Faculty of Economics and Business, Universitas Muhammadiyah Mamuju, Indonesia.
- Ratna – Lecturer at the Department of Development Economics, Faculty of Economics and Business, Universitas Muhammadiyah Mamuju, Indonesia.
Research Source
- Article Title: The Impact of Transportation Costs, Accessibility, and Livelihood Types on Community Income in Karampuang Island, Mamuju Regency
- Journal Name: International Journal of Integrated Science and Technology (IJIST)
- Publication Year: August 2026
- DOI:
https://doi.org/10.59890/ijist.v4i8.41
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