Sovereign wealth funds hold enormous assets and buy almost none of them domestically. The reason is macroeconomic rather than a search for better returns.
Where the money comes from
Most such funds are built from revenue that arrives in foreign currency, typically resource exports or persistent trade surpluses. The state receives more foreign currency than the economy needs.
Converting all of it into domestic currency would increase the money supply and raise the exchange rate. Both effects are damaging to the non-resource economy.
Holding the revenue offshore in foreign assets avoids that conversion. The fund is a sterilisation mechanism before it is an investment vehicle.
The problem of an appreciating currency
A resource boom raises the exchange rate, which makes a country's manufacturing and agriculture uncompetitive. Those sectors shrink while the boom lasts and do not return quickly when it ends.
The effect has been observed repeatedly in resource-rich economies and is a central argument for saving revenue abroad. The fund insulates the domestic economy from its own export success.
Spending rules commonly limit annual transfers to the budget to an estimated long-run return. That converts a volatile revenue stream into a stable one.
Saving across generations
Resource revenue is the conversion of a finite asset into cash. Spending it entirely in the year it arrives transfers wealth from future citizens to present ones.
A fund converts depleting physical wealth into financial wealth that continues to produce income. The framing is one of asset substitution rather than saving.
Funds built on trade surpluses follow similar logic against demographic change. Assets are accumulated while the workforce is large and drawn on when it is not.
How they invest differently from other institutions
Without near-term liabilities, these funds tolerate illiquidity and long horizons that pension funds cannot. Infrastructure, property and private holdings feature heavily.
Their scale gives access to transactions unavailable to smaller investors, and allows very low-cost passive holdings of public markets. Both advantages come from size rather than skill.
Some publish holdings and voting records in detail while others disclose little. Practice varies widely between funds.
Why their investments attract scrutiny
A state-owned investor acquiring strategic assets abroad raises questions that a private investor does not. Host countries review such transactions under national security frameworks.
Funds have responded by taking minority stakes and adopting voluntary transparency principles. The aim is to be treated as a financial rather than a political investor.
Screening regimes have broadened in many countries over the last decade, and the sectors covered differ by jurisdiction and continue to change.