Share your insights or perspective on the financial matter presented in the input.

What is the best asset allocation for a retirement portfolio, and why?
The best asset allocation is one that lets you sleep well at night. Can you stomach a loss of 50% and hold on to that asset for 3 years, 5 years, or however long it will take to bounce back while everyone is telling you to sell it at a loss? All these calculations will be thrown out the window at the next market panic. You've probably been in situations where everyone's panicking and the market seems upside down and there are no rules. Most people think they'll stay rational, but unless you've been through a market panic, you don't really know how you'll react.