Pension funds in smaller economies often hold most of their assets abroad. The decision follows from the size of the domestic market and from what members are already exposed to.
The domestic market is too small
A pension system can accumulate assets worth a large multiple of its national listed market. There is simply not enough domestic security to buy without distorting prices.
Concentrated buying in a small market raises valuations and reduces future returns for the buyer itself. The fund would be bidding against its own members' interests.
Liquidity is the practical constraint. A fund that owns a large share of a market cannot rebalance without moving prices against itself.
Members are already exposed to the home economy
A member's wages, job security and house value all depend on the domestic economy. Investing their pension there as well concentrates every source of income on one outcome.
A domestic downturn would then reduce employment and retirement savings simultaneously. Diversification across borders is what breaks that link.
This reasoning applies with particular force in economies dependent on a single industry. Foreign assets provide income that does not move with the local commodity cycle.
What the currency decision adds
Foreign assets bring foreign currency exposure, which is a separate risk from the assets themselves. Funds must decide how much of it to keep.
Liabilities are paid in the home currency, so unhedged exposure introduces volatility that has nothing to do with investment skill. Most funds hedge a substantial share.
Some deliberately retain exposure to currencies that strengthen during global stress, since that behaviour offsets equity losses. The hedging ratio is a policy choice rather than a technical detail.
The constraints that limit foreign holdings
Several countries impose limits on how much of a pension fund may be invested abroad. The motive is usually to retain domestic investment capacity.
Such limits force funds into a smaller opportunity set and can raise the cost of meeting liabilities. Limits and their calculation differ by jurisdiction and are periodically revised.
Tax treatment adds friction, since dividends from foreign holdings may face withholding that a domestic holding would not. Treaty relief is available in many cases but requires administration.
How this affects global markets
Pension capital is long-dated and relatively insensitive to short-term prices, which makes it a stabilising presence in the markets it enters. Rebalancing rules produce buying after falls.
Aggregate allocation shifts by large funds move substantial sums across borders. Changes in policy or funding position show up as capital flows rather than as trading activity.
The direction is not permanent. Improved funding levels frequently prompt a move toward domestic bonds, which reverses the flow.