International Allocation: The Case For and Against

The international allocation question asks what share of your stock money belongs outside your home market - and it remains investing's most durable argument because both sides hold real evidence. Pro-diversification voices cite the majority of world market value living abroad and decade-scale leadership rotations; home-bias voices cite currency matching, withholding frictions, and American multinationals already collecting global revenue. This guide presents each case at full strength, describes conventional practice, and leaves the dial where honest analysis does: deliberately chosen rather than defaulted.

The case for going global

• Market breadth: roughly two-fifths or more of world equity value trades outside the US; owning only home markets means skipping entire industries - luxury houses, semiconductor equipment leaders, global banks.
• Regime diversification: national economies decouple sometimes; simultaneous US-and-abroad disasters have been rarer than US-only slumps.
• Leadership rotates across decades: stretches of international outperformance have alternated with US dominance on timescales longer than most investors' patience - which is precisely the diversification argument.
• Valuation optionality: starting valuations differ across regions at any moment, and long-run returns correlate loosely with what you initially pay.

The case for home bias

• Liability matching: YOUR expenses are dollar-denominated; foreign assets import currency swings into retirement purchasing power.
• Frictions: foreign withholding taxes on dividends, fund-level tax drag complexity, and slightly higher expense ratios on international products.
• US multinationals already globalize domestic indexes - a large slice of revenue for big US firms originates abroad, delivering some international exposure implicitly.
• Behavioral survivability: investors monitor and endure portfolios better when they recognize the companies inside them.
• Reporting quality and shareholder-rights differences vary across jurisdictions, adding analytical overhead.

Foreign index rises +8% in local currency
Dollar strengthens 5% against that currency:
  USD-holder return = 1.08 / 1.05 - 1 = ~+2.9%
Same fund, same companies - currency moved a third of your result;
over decades the swings partially wash, over years they dominate headlines

What common practice looks like

Surveys of target-date families, robo defaults, and planning frameworks cluster international exposure around twenty to forty percent of the stock sleeve, frequently implemented as one developed-plus-emerging total-international fund. Market-cap-weighted purists go further, weighting regions by their actual share of world capitalization. Home-bias traditionalists run lower or zero. All three camps contain wealthy, patient retirees - evidence that consistency matters more than the specific number chosen.

Implementation notes worth knowing

1. Developed-versus-emerging split exists within 'international'; total funds blend them so beginners need not choose.
2. Expense ratios run modestly above US equivalents - check candidates against peers, not against US funds.
3. Foreign dividends carry withholding taxes; inside shelters this vanishes, while taxable accounts may reclaim portions via credits.
4. Hedged share classes exist for bond-heavy allocations; equity investors usually accept unhedged currency as part of the diversification purchased.
5. Emerging sleeves swing harder; sizing follows risk capacity like everything else.

Deciding your own number

Three questions resolve most personal answers. First, where will spending occur in retirement - heavy foreign-currency futures argue upward. Second, what behavior survived your last international drought - holders who abandoned during underperformance owned nothing but losses. Third, does your plan treat international as diversification or as performance-chasing? The first two anchor reality; the third predicts persistence. Whatever emerges, write it down beside your broader allocation so future reviews judge adherence rather than hindsight.

The bottom line