The Three-Fund Portfolio is an investing staple on the fantastic forums at Bogleheads.org.  While the allocation percentages are not static and may vary by individual investor, the one represented here is perhaps the most popular starting point.

Asset Allocation

• 40% Total Domestic Market
• 20% World
• 40% Intermediate Term Bonds

 

The charts below display the results for the ex-US version of World.  Non-US investors may also be interested in the US-inclusive option available in the calculators.