Inflation Dynamics in Indonesia: A Systematic Review of Monetary Determinants, Growth Nexus, Spatial Transmission, and Forecasting Methodologies
This systematic review synthesizes nine empirical studies (2018–2026) to reveal that Indonesia's inflation is primarily driven by money supply and global food prices with a nonlinear growth threshold near 9.59%, exhibits significant spatial transmission across provinces, and is best forecasted using machine learning tools like LSTM, thereby highlighting the necessity for coordinated monetary-fiscal policies and region-sensitive strategies.
Original paper licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). This is an AI-generated explanation of the paper below. It is not written or endorsed by the authors. For technical accuracy, refer to the original paper. Read full disclaimer
Imagine Indonesia's economy as a massive, bustling kitchen where the head chef (the Central Bank) is trying to keep the price of a bowl of rice stable. Sometimes the rice gets too expensive, and sometimes it's too cheap. This paper is like a "taste test" of nine different recipes (studies) that chefs have tried between 2018 and 2026 to figure out exactly how to control the price of that rice.
Here is what the paper found, broken down into simple, everyday concepts:
1. The Main Ingredient: Money Supply
Think of the money in the economy like water in a garden hose. The paper found that the amount of water flowing through the hose (the money supply) is the main thing that decides how fast the plants grow (inflation).
- The Finding: If the Central Bank opens the tap too wide (prints more money), the "price of rice" goes up. If they turn the tap down (raise interest rates), the price goes down.
- The Analogy: It's like a balloon. If you keep blowing air into it (adding money), it gets bigger (prices rise). The paper confirms that controlling the air pump is the most effective way to keep the balloon from popping.
2. The "Too Much of a Good Thing" Rule (The Threshold)
There is a sweet spot for how much inflation is okay. The paper found a specific "speed limit" for prices.
- The Finding: If prices rise slowly, it's fine. But if they speed past a certain point (around 9.6%, or even 5.2% in some cases), the whole economy starts to slow down, like a car engine overheating.
- The Twist: This speed limit isn't the same everywhere. In the "West" of Indonesia (more developed areas), the engine overheats at lower speeds. In the "East" (less developed areas with more farming), the engine can handle a bit more heat before it breaks. This means a "one-size-fits-all" speed limit might be unfair to the eastern provinces.
3. The Government's Shopping Cart (Fiscal Policy)
The paper looked at what happens when the government goes shopping (spends money).
- The Finding: When the government buys a lot of things (spends heavily), it acts like a giant hand pushing up the price of food. This is especially true for food prices.
- The Analogy: Imagine a crowded market. If a giant (the government) suddenly starts buying all the tomatoes, the price of tomatoes shoots up for everyone else. The paper says this "shopping shock" sticks around for a long time, making food expensive even after the government stops buying.
4. The Global Weather Report (Imported Prices)
Indonesia relies heavily on buying food and energy from other countries.
- The Finding: When food prices go up in the rest of the world, they go up in Indonesia, too. But here's the catch: if global prices go down, prices in Indonesia don't drop as much.
- The Analogy: It's like a one-way street. It's easy for a heavy truck (high global prices) to push the door open and let prices rise, but it's hard for the door to swing back open easily when the truck leaves (low global prices). This is called "downward price rigidity." Also, the value of the Indonesian currency (the Rupiah) is the biggest switch that controls how much these global prices affect the local market.
5. The Ripple Effect (Spatial Dynamics)
Indonesia is made up of thousands of islands. The paper found that inflation doesn't stay in one city; it travels.
- The Finding: If food prices go up in one province, they quickly spread to neighboring provinces, like ripples in a pond.
- The Analogy: Think of the islands as rooms in a house with open doors. If you heat up the kitchen (one province), the heat quickly spreads to the living room and bedroom (neighboring provinces). The paper says we need to watch the whole house, not just the kitchen, to understand the temperature.
6. The Crystal Ball (Forecasting)
Finally, the paper tested different ways to predict the future price of rice.
- The Finding: Old-school math models are okay, but a type of computer brain called LSTM (a machine learning tool) is better at seeing the long-term patterns.
- The Analogy: Imagine trying to guess the weather. A human looking at yesterday's weather (old models) is okay, but a super-computer that remembers the weather patterns of the last 10 years (LSTM) can make a much smarter guess about next week. The paper suggests the Central Bank should start using these "super-computers" to predict inflation.
The Big Takeaway
To keep the economy healthy, the Central Bank and the Government need to work together like a well-coordinated dance team.
- Watch the Water: Keep the money supply steady.
- Respect the Speed Limit: Don't let inflation get too hot, but remember that different regions have different limits.
- Coordinate the Shopping: Government spending needs to be careful not to push food prices up too high.
- Use the Super-Computer: Use advanced AI tools to predict the future so they can act before prices get out of control.
The paper concludes that by using these insights, Indonesia can keep its "rice bowl" affordable for everyone without overheating the economy.
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