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· 23 min read · Jonathan Chrisnaldy

What Should My Family Worry About If MSCI Drops Indonesia?

MSCI has proposed moving Indonesia to Standalone status, and people fear a chain: stocks crash and stay down, the rupiah falls, foreign money leaves, prices rise faster. Against Indonesia's own record, foreign money left Indonesian shares around four of six past shocks, but the index was back above its pre-shock level a year later in four of five; inflation sped up by 2 percentage points or more after one of six rupiah slides, a bank deposit lost buying power after two of six, and consumer-loan rates rose a point or more after one of six.

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On 16 October 2026, the IHSG closed 11.57 percent lower, at 5,185 (Indonesia Stock Exchange, 2026), after the index provider MSCI proposed moving Indonesia out of its emerging markets and into a category called Standalone (Reuters, 2026). I read the headlines in New York, and what came to mind was not the index. It was my family in Jakarta: what they pay for groceries, fuel and the basics of daily life, and their rupiah savings for retirement.

The fear runs like a chain. The market crashes and stays down, the rupiah falls, foreign investors leave, and the cost of living rises faster. For a family, the chain does not stop at prices; it reaches savings and the cost of borrowing. I tested each link against Indonesia’s own history. A year after a shock, the index was back above its pre-shock level in four of five cases. Three months after a shock, the rupiah was 5 percent or more weaker in two of six. Foreign investors pulled money out around four of six past shocks. Prices kept rising after six of six sharp falls in the rupiah, but inflation sped up by 2 percentage points or more after one of six. A bank deposit lost buying power after two of six, and the rate on consumer loans rose a percentage point or more after one of six. By my tests, the foreign-money link holds; the other links do not.

This is not financial advice, and it is not a forecast. It is what Indonesia’s own record says about the fears, written for my family and for anyone who felt the same jolt.

What Standalone means, and what it does not

Standalone sounds like a verdict on a country, the kind of label that should sit next to poverty, corruption or war. It is not. MSCI sorts markets by economic development, by the size and liquidity of their shares and by how easily foreign investors can get money in and out, and economic development decides whether a market is Developed, not where the others sit (Baskoro, 2026). Standalone is the category outside the main groups: markets not yet admitted, and markets taken out of the main groups over serious problems with accessibility or with how the market works (Baskoro, 2026).

That is why the company Indonesia might keep looks odd. Euronews lists Jamaica, Panama and Palestine as Standalone markets (Katanich, 2026), and CNN Indonesia (2026) also names Zimbabwe. What these markets share, in MSCI’s terms, is not income.

MSCI’s stated concerns about Indonesia are about who owns the shares and how they trade: a lack of clarity in shareholding structures and suspected coordinated trading (Katanich, 2026). MSCI considered a smaller step down, to frontier status, and set it aside as not reflecting the problems (Reuters, 2026). It is still a proposal: feedback runs until 30 April 2027, and MSCI plans to decide by 30 June 2027 (Desfika & Wijaya, 2026).

How I tested the fear

I used Indonesia’s own history and fixed the rules in a pre-registration on GitHub, with later changes dated. I wrote the first four tests before downloading any data, then changed their data sources and some details after checking the data but before computing any result. I added the savings and borrowing tests after seeing those four results. Their rules were fixed before I read the rate data, but not before I knew the broad outline of Indonesia’s economic history. So before reading that data I wrote down what I expected for each comparison. Twenty-two of the twenty-two predictions I could check came true, so read the savings and borrowing results as confirming what an attentive reader could have guessed, not as discoveries.

Two kinds of events anchor the tests. A shock month is a month whose closing IHSG level is 10 percent or more below the previous month’s close; since 2004, six episodes qualify, starting in August 2005, March 2008, September 2008, March 2020, February 2025 and March 2026. The stock, rupiah and foreign-money tests start from these. A rupiah slide is a month when the rupiah is 7 percent or more weaker against the dollar than three months earlier. The price, savings and borrowing tests start from slides, the route by which a weaker rupiah would reach a family’s costs.

A link holds by my test when two thirds or more of the past episodes meet it, does not hold when a third or fewer do, and is mixed in between. An episode counts for a link only once its outcome is known.

The markets: stocks, the rupiah and foreign money

The fear starts in the markets, so I keep this part short.

Stocks crash; that is what a shock month is. Staying down is another matter. A year after the shock month, the index was back above its level before the shock in four of five episodes, so this link does not hold by my test. The exception is March 2008: a deeper fall followed that September, and a year on the index was still 47.3 percent below. The episode that began in March 2026 has not reached its year yet. By August 2026, the index stood 20.8 percent below its level before that shock, on Bank Indonesia’s preliminary figures; at the 16 October close, it stood 37.0 percent below. The warning had been building. In January, MSCI froze its index rebalancing for Indonesian shares over concerns about free float (Sigit, 2026), and on 28 January 2026 the IHSG closed 7.35 percent lower.

Three months after the shock month, the rupiah was 5 percent or more weaker against the US dollar in two of six episodes: after September 2008, by 19.7 percent, and after March 2026, by 6.6 percent. This result sits exactly on my line of a third; without this year’s episode it would be one of five.

Line charts after each IHSG shock episode since 2004, indexed to the month before. Top: the IHSG; a year after the shock it was back above that level in four of five episodes, and the episode that began in March 2026 is open, with a dotted end at the close on 16 October 2026, 37.0 percent below its level before that shock. Bottom: the rupiah per US dollar, where higher means weaker; it was 5 percent or more weaker three months on in two of six episodes.
An IHSG shock month: a month-end close at least 10% below the previous month-end; a shock within 3 months of an earlier one joins its episode. Each line runs from the month before the shock to 12 months after it; an open episode is not counted for a test it has not reached. IHSG month-end closes: Bank Indonesia, SEKI Table III.3, from December 2005; Bapepam, Statistik Pasar Modal, January 2004 to November 2005; 3 months corrected to IDX Statistics 2007, IDX Statistics 2009 and IDX Monthly Statistics April 2021 (Indonesia Stock Exchange, accessed 17 October 2026) and 3 to Bapepam-LK, Statistik Pasar Modal. Bank Indonesia marks June to August 2026 as preliminary (the last three solid points of the Mar 2026 line). Its closes for 1995 to 2003 are not used: they failed a check against the exchange’s own figures. Dotted ends, not from Bank Indonesia: the IHSG close on 30 September 2026 (OJK, Portal Data SJK Terintegrasi) and on 16 October 2026, placed at its day in the month (IDX Daily Statistics, Indonesia Stock Exchange, idx.co.id, accessed 17 October 2026); the rupiah on 16 October 2026 from the European Central Bank’s reference rates. Rupiah per US dollar: Bank for International Settlements, US dollar exchange rates (national sources: US Federal Reserve, then European Central Bank); month-end values and the index calculated by the author. Calculations by the author. Non-commercial use.

Foreign money is the link that holds. Over the quarter that contains the shock month and the next quarter, foreigners took money out of Indonesian shares in four of six episodes. In the episode that began in March 2026, the outflow came to US$4.0 billion over those quarters, and in the weeks OJK files under January to September 2026, foreign investors sold a net Rp82 trillion of Indonesian shares on the exchange. It holds by a thin margin. Four of six is exactly two thirds, and without this year’s episode it would be three of five, which is mixed.

Bar chart of net foreign purchases of Indonesian shares over the quarter of each IHSG shock and the next, in US dollars. There were net outflows around four of six episodes, including 4.0 billion around the March 2026 episode; the quarter of the October 2026 fall is not yet published.
An IHSG shock month: a month-end close at least 10% below the previous month-end; a shock within 3 months of an earlier one joins its episode. Net foreign purchases of Indonesian equities: balance of payments, portfolio investment liabilities, equity and investment fund shares, net incurrence, summed over the quarter that contains the shock month and the next quarter, so each window starts before the shock. A negative value means non-residents cut their holdings through sales, buybacks or fund redemptions. Mar 2026 is counted here: both of its quarters are published. The fall of 16 October 2026 is not shown: its quarter is not yet published. Flows: International Monetary Fund, Balance of Payments statistics; sums calculated by the author. Non-commercial use.

At the market and the pump

This is the link my family would feel, in groceries, fuel and the basics of daily life. The useful question is not whether prices rise, since they rise in a normal year, but whether a rupiah slide makes them rise faster. Prices kept rising after six of six slides. Inflation sped up by 2 percentage points or more after one of six: after August 2005, when it went from 8.3 percent to 14.9 percent. After the slides of 2008, 2013, 2015 and 2020, prices rose more slowly than in the year before. BPS’s own published rates, as Bank Indonesia reports them (Bank Indonesia, 2026a), differ by as much as 0.8 percentage points from the figures I computed and give the same count.

In October 2005, inside the year after the August slide, the government raised the price of Premium petrol by 87.5 percent and of Solar diesel by 104.8 percent (Presiden Republik Indonesia, 2005). Before the slides of 2008 and 2013, it had raised both fuels by 22 percent or more inside the twelve months my test uses as “before” (Kementerian Energi dan Sumber Daya Mineral, 2014; Menteri Energi dan Sumber Daya Mineral, 2008, 2013). It cut them in the year after the 2008 and 2015 slides (Direktorat Jenderal Minyak dan Gas Bumi, 2016; Menteri Energi dan Sumber Daya Mineral, 2009). Bank Indonesia’s own page on inflation names the fuel price rises of 2005 and 2008 as the source of surges in inflation (Bank Indonesia, n.d.). My test describes this timing; it does not measure how much of any price change came from fuel.

Dumbbell chart of consumer price inflation over the twelve months up to and after each rupiah slide. Prices rose after six of six slides; inflation was 2 percentage points or more higher after one of six, after August 2005. Rows under the chart count the government's changes to Premium and Solar prices in each window. The 1997 slide, shown apart and not counted: inflation went from 7.3 to 82.4 percent.
A rupiah slide: a month-end rate at least 7% weaker against the US dollar than 3 months earlier, after the rupiah’s float in August 1997; slides within 12 months of an earlier one join its episode. The pre-registered threshold was 10%; 3 episodes starting after 1998 met it, fewer than 4, so the rule’s fallback of 7% applies. The 1997 slide is shown apart and not counted: it combined a banking crisis with the end of the managed rupiah; with it included, 2 of 7. Inflation: change in the headline consumer price index over the 12 months up to the slide’s first month and over the 12 months after it; pts: percentage points. Fuel price changes: changes in the government-set retail price of Premium gasoline or Solar diesel, among those verified in the regulations and official notices; from 2015 the Premium price the government set applied outside Java, Madura and Bali. Kerosene, LPG, electricity and other fuels are not covered. Prices: International Monetary Fund, Consumer Price Index (headline index, compiled by BPS-Statistics Indonesia); inflation calculated by the author. Rupiah per US dollar: Bank for International Settlements, US dollar exchange rates (national sources: US Federal Reserve, then European Central Bank); month-end values calculated by the author. Non-commercial use.

The slide of 1997 is the one people remember, and there inflation went from 7.3 percent to 82.4 percent. As I decided before looking, it is shown apart and left out of the count; with it included, the result is two of seven, which still does not hold.

So far there has been no slide. On 16 October, the rupiah was 0.1 percent stronger against the dollar than at the end of July.

Savings and loans

This section records what a rupiah bank deposit earned against prices after past slides. It does not say where anyone should keep their savings, and it is not financial advice.

My family’s retirement savings are in rupiah, so the question I care about is whether a slide eats into their buying power. A bank time deposit is a plain rupiah saving with a published rate, so I tested a hypothetical one: a one-month deposit at the average rate of Indonesia’s commercial banks (Bank Indonesia, 2026b), rolled over each month for the twelve months after the slide, after the 20 percent final tax on its interest (Pemerintah Republik Indonesia, 2000), against prices over the same months.

The deposit lost buying power after two of six slides, after May 2004 and August 2005, so this link does not hold by my test, though two of six sits exactly on my line of a third. Across the 261 twelve-month periods starting from January 2004, the same deposit lost buying power in 34 percent. After the 1997 slide, under the tax then in force, the deposit lost 23.3 percent of its buying power; with 1997 included, the count is three of seven, which is mixed.

For anyone with a bank loan, the question is the rate. The average rate banks charged on consumer loans (Bank Indonesia, 2026b) was a percentage point or more higher a year after the slide in one of six cases: after August 2005, by 1.9 points. Bank Indonesia’s policy rate (for May 2004, the one-month SBI rate) rose by 0.25 percentage points or more in the slide month or the three months after in two of the five slides I could check, after 2008 and 2013; for 2005, I could not find its rate for July. A fixed-rate loan does not move at all, and loans from finance companies and pawnshops are not in these figures.

Bar charts for each counted rupiah slide. Top: the buying power of a one-month rupiah deposit after tax, twelve months on; it fell after two of six slides, May 2004 and August 2005. Bottom: the change in the average consumer-loan rate over twelve months; it rose a point or more after one of six, after August 2005.
A rupiah slide: a month-end rate at least 7% weaker against the US dollar than 3 months earlier, after the rupiah’s float in August 1997; slides within 12 months of an earlier one join its episode. Savers: a one-month rupiah time deposit at commercial banks as a whole (Bank Indonesia, SEKI Table I.28), rolled over each month for the 12 months after the slide month, after the 20% final tax on its interest, against consumer prices over the same months; buying power is the deposit’s end value in the slide month’s prices against its start value. Borrowers: the average rate on rupiah consumer loans at commercial banks as a whole (SEKI Table I.26), 12 months after the slide month against the slide month. Bank Indonesia’s tables do not say whether the rates are weighted averages or cover new or existing balances. Savings accounts, longer deposits, other assets and loans outside banks are not covered. Rates credited to Bank Indonesia. Prices: International Monetary Fund, Consumer Price Index (headline index, compiled by BPS-Statistics Indonesia); inflation calculated by the author. Rupiah per US dollar: Bank for International Settlements, US dollar exchange rates (national sources: US Federal Reserve, then European Central Bank); month-end values calculated by the author. Non-commercial use.

What I would tell my family

Here is the scorecard, by my tests:

The fearMy testResultBy my test
Stocks crash and stay downStill below the pre-shock level a year laterOne of fiveDoes not hold
The rupiah falls5 percent or more weaker three months onTwo of sixDoes not hold
Foreign investors leaveNet outflow over the shock’s quarter and the nextFour of sixHolds
Inflation speeds up2 points or more faster over the year after a slideOne of sixDoes not hold
Savings lose buying powerA deposit, after tax, behind pricesTwo of sixDoes not hold
Borrowing gets dearerConsumer-loan rate a point or more higher a year onOne of sixDoes not hold

So my message home would be this. The stock market can keep falling, and foreign money is already leaving Indonesian shares. Faster inflation, a deposit’s lost buying power and consumer-loan rates a point or more higher followed past slides in a minority of cases, and the rupiah has not slid so far. The thing to watch at home is not the index. It is the price of fuel. Before MSCI decides, I would also watch whether the concerns it raised, about who owns the shares and how they trade, are addressed, and whether the rupiah makes a slide by the rule above.

The limits of this test

  • The samples are small: five or six episodes per link. For stocks, the rupiah, foreign money and savings, a different outcome in one episode would change the verdict. Read with the pivot a month earlier, inflation sped up after two of six slides, exactly on my line, which still does not hold.
  • No past episode here was an MSCI downgrade. This compares the falls Indonesia has had with the fall it is having, not downgrades with downgrades.
  • The stock series starts in 2004. Bank Indonesia’s earlier month-end figures failed a check against the exchange’s own records, so the 1997 crash is in the price and savings tests but not in the stock tests.
  • March 2008 barely counts as a shock: the index fell 10.1 percent that month, against a threshold of 10 percent.
  • The slide rule has another reading. Read as I fixed it, slides in the few years that followed join the 1997 episode; cut at the end of that crisis instead, the inflation link does not hold.
  • Food prices are not tested: no consistent food price series runs back far enough. Fuel is described, not tested, and covers the pump prices of Premium and Solar, not other fuels; from 2015 the Premium price the government set applied outside Java, Madura and Bali.
  • The savings test uses a one-month bank deposit. Savings accounts, longer deposits, gold and pensions are not covered, small balances that escape the tax are not modelled, and a year says little about savings held for decades.

Method notes and credits

The rules, data checks and code are in the post’s folder on GitHub, including the pre-registration, its dated amendments and the predictions. Shock months use the IHSG’s month-end close: Bank Indonesia’s statistics table III.3 from December 2005 (Bank Indonesia, 2026c), Bapepam’s capital market statistics before that (Badan Pengawas Pasar Modal, 2005), and six months corrected to the Indonesia Stock Exchange’s own figures (Indonesia Stock Exchange, 2007, 2009, 2021) or Bapepam-LK’s (Badan Pengawas Pasar Modal dan Lembaga Keuangan, 2007). Each month from December 2005 was checked against an independent publication. The rupiah is the daily US dollar rate from the Bank for International Settlements (2026), with the European Central Bank’s reference rates (European Central Bank, 2026) used for the last few days, computed by me. Foreign money is the International Monetary Fund’s balance of payments: portfolio investment in Indonesian equity, net, in US dollars (International Monetary Fund, 2026a). Prices are the International Monetary Fund’s headline consumer price index for Indonesia, compiled by BPS-Statistics Indonesia (International Monetary Fund, 2026b), set beside BPS’s published rates from Bank Indonesia’s inflation data (Bank Indonesia, 2026a). Deposit, loan and policy rates are Bank Indonesia’s statistics tables I.28 and I.26, for commercial banks as a whole, and I.25.A (Bank Indonesia, 2026b); each was checked against an earlier edition of the same table. Fuel price changes come from government regulations and official notices, each stored and checked by script. Changes, returns, sums and inflation rates are my calculations. The October figures for the index come from the Indonesia Stock Exchange’s daily statistics (Indonesia Stock Exchange, 2026), the January fall from OJK’s data portal (Otoritas Jasa Keuangan, 2026a), and the foreign selling on the exchange from the same portal (Otoritas Jasa Keuangan, 2026b).

Credits: Bank Indonesia (as its data policy requires: Bank Indonesia, 2024), Bapepam and Bapepam-LK, the Indonesia Stock Exchange, OJK, BPS-Statistics Indonesia, the Ministry of Energy and Mineral Resources and Pertamina, the Bank for International Settlements, the US Federal Reserve, the European Central Bank and the International Monetary Fund. This post is not endorsed by any of them, and its use of their data is non-commercial. MSCI’s own documents were not used; its announcement is reported here from the press.

References

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// About the author

Jonathan Chrisnaldy is a product manager and analyst in New York City, with an M.S. in Technology Management from Columbia University. He writes data stories about the numbers behind everyday claims. More on the experience page or LinkedIn.