HONG KONG/MUMBAI/JAKARTA — The populist leaders of India, Indonesia and the Philippines won office with promises of massive spending to upgrade their nation鈥檚 roads, railways and ports.

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A money changer teller counts Philippine Peso in Manila on Monday, August 14, 2017. — KJ ROSALES/PHILIPPINE STAR

Doing so, the thinking goes, would supercharge economic growth and emulate China鈥檚 success.

India鈥檚 Prime Minister Narendra Modi intends to spend a record $60 billion on infrastructure this fiscal year.

Philippine President Rodrigo R. Duterte set an infrastructure spending goal of seven percent of gross domestic product, while Indonesian leader Joko Widodo has added 7,000 kilometers of new roads and four new airports and last week vowed more.

In a global landscape starved of yield, foreign investment has poured in to help fund the ambitions, lured by young populations and some of the world鈥檚 fastest rates of economic growth.

As a sign of their resilience, the trio have even shaken off interest rate hikes by the Federal Reserve, something that has tripped up many a developing nation in the past.

But now, the Fed is set to embark into uncharted territory by shrinking its $4.5-trillion balance sheet and old vulnerabilities are starting to resurface. The problem the three nations face is that, unlike China, they lack the industrial, export and domestic savings bases needed to fund their plans.

To dig foundations and pour cement, heavy equipment must be imported, weakening current accounts just as faster growth is also swelling imports. And the cost of the projects is pressuring budget deficits, leaving the governments heavily reliant on foreign cash.

鈥淪tepping up infrastructure investments in these large Asian emerging markets will likely widen the current account deficit and increase external debt,鈥 said Chua Hak Bin, a Singapore-based senior economist with Maybank Kim Eng Research. 鈥淒epending on the form of external financing, some emerging markets could become more sensitive to volatile foreign capital flows and currency mismatch risks.鈥

There are already signs of that strain in foreign-exchange markets.

The Philippine peso is Asia鈥檚 worst performer against a lackluster greenback this year, down more than three percent.

Indonesia鈥檚 rupiah is the third-worst, while India鈥檚 rupee is in the middle of the Asian pack.

With the world鈥檚 top central bankers gathering at the Jackson Hole mountain retreat in Wyoming this week, any comments signaling a faster-than-anticipated normalization in developed-world policies could sharpen investors鈥 minds on the potential fallout.

When compared to other major emerging markets like Brazil, South Africa, Turkey and Russia, the economies of India, Indonesia and the Philippines look in relatively good shape, said Rob Subbaraman, chief economist for Asia ex-Japan at Nomura Holdings Inc.

鈥淧olicy makers are aware of the risks of capital outflows, which helps explain their continued build-up of foreign exchange reserves,鈥 he said.

And not all deficits are bad — if the financing is for productive purposes, that should lure more investment and boost growth, he said.

The Asian Development Bank estimates emerging economies in the region need to invest as much as $26 trillion through 2030 to build transport networks, boost power supplies and upgrade water and sanitation facilities.

And overall debt levels remain low by global standards. So for now at least, foreign investors continue to underpin expectations for growth rates above five percent.

Much will hinge on what happens with the US dollar. If it remains weak, there may be no cause for concern, said Alicia Garcia Herrero, Hong Kong-based chief economist at Natixis. Even if the greenback strengthens, the three have room to increase interest rates to keep foreign capital from leaving, she said.

Lingering problems with its banking system and a stronger currency make India the most exposed to global tightening among the three, she said, followed by Indonesia.

A weaker peso has already helped the Philippines adjust.

While the risk of serious disruption appears low, 鈥渂alance sheet reduction is new and it is hard to foresee the consequences,鈥 she said.

India鈥檚 general government debt level is 鈥渟ignificantly鈥 higher compared with similarly rated countries, Moody鈥檚 Investor Service has warned.

While the federal government aims to narrow Asia鈥檚 widest budget gap to 3.2% of gross domestic product (GDP) in the current fiscal year, from 3.5%, its top economic adviser said the outlook is 鈥渦ncertain鈥 given risks from slower growth and policy uncertainty.

Then there鈥檚 the risk of a blowout in India鈥檚 current account deficit, which the International Monetary Fund projects to be at its widest since 2013, when the Fed first signaled tightening after years of unprecedented stimulus.

Defaults on bonds and syndicated loans by Indian companies are at a record of almost $2 billion so far this year, compared with $494 million for all of 2016, according to data compiled by Bloomberg.

鈥淲e expect the balance sheet reduction program of the Fed to potentially impact the flow dynamic in EM countries, to which India may not remain immune,鈥 said Kaushik Das, Mumbai-based chief economist at Deutsche Bank AG.

In Jakarta, President Widodo, known as Jokowi, has made infrastructure a foundation of his first term in office, vowing a year ago to develop 鈥渆very inch鈥 of an archipelago that would stretch almost from New York to London. That comes at a cost: Indonesia鈥檚 government projects the 2017 budget deficit will widen to 2.9% of GDP, just short of a legal limit of three percent.

Having increased government spending on infrastructure to more than 60% of the annual budget since taking office in 2014, Jokowi鈥檚 chances of re-election in 2019 are tied to his nation-building agenda. Problem is, the current account deficit has widened too, hitting $5 billion or 1.96% of GDP in the second quarter.

Indonesia鈥檚 economy is projected to grow next year by 5.4% — which would be the fastest pace since 2013. But that remains well short of the seven percent target Jokowi set when he came to power three years ago.

鈥淚 think it is difficult to expect that Indonesia will achieve the relatively high growth this year, next year and in the next couple of years,鈥 former finance minister Chatib Basri said in an interview in Jakarta.

He said Indonesia must embrace 鈥渂old reform鈥 if it wants more foreign investment and higher growth, but that doing so is extremely difficult when nationalist sentiments tend to dominate elections. He points out that while the next presidential election is not until 2019, the campaigning will begin much sooner with candidates finalized in September next year.

Similar pressures are being felt in the Philippines, where the central bank expects the first current account deficit in 15 years in 2017.

Mr. Duterte鈥檚 plan to raise taxes to help fund the infrastructure program faces delays as lawmakers worry about a backlash from voters. Slower growth and a credit-rating downgrade are risks if lawmakers water down the government鈥檚 tax-reform plan, the finance department has warned.

鈥淭he Philippines is quite vulnerable to Fed balance-sheet consolidation as its current account position is deteriorating,鈥 said Sanjay Mathur, chief economist for ASEAN and India at Australia & New Zealand Banking Group Ltd. in Singapore.

The risks for the three nations haven鈥檛 gone unnoticed by the International Monetary Fund, which warned in May that tighter financial conditions could trigger volatility in Asia鈥檚 capital flows.

Whereas China鈥檚 steady stream of export earnings and huge pile of domestic savings meant it could and still can fund its infrastructure plans, the underlying fragility for India, Indonesia and the Philippines leaves them more exposed should global markets seize.

鈥淲e are weary of the argument that large current account deficits are justifiable so long as the deficit is driven by infrastructure investments,鈥 said Maybank鈥檚 Mr. Chua. — Bloomberg