<prompt> Human: As the title say, Im 30 and have fully adopted a Bogle head point of view for my retirement. Am putting away close to 40 of my earnings towards a retirement in Indexed US stocks, International Stocks and US bonds.Everything I read talks about the long term growth of 4-7 of my investment. It seems like the safest bet to make. And yet the Great Depression was so recently that my grandmother lived through it. I am concerned that I am surrounded by a specific time in human history last 80 years that has benefited the US market so well that everything I have read, people I have listened to, and wisdom I have sought has been very shortsighted. This might be a ramble and I dont think I have other safe options for my financial future but does this keep anyone else up at night?TLDR What is to say this continued US economic prosperity is not a nearsighted 80 year overly optimistic outlook? Assistant: You have no safer alternative than the US economy. Its as stable and predictable as they come over the long term. Human: I would agree with you completely which is why my AA is what it is. My main point was basing a stability and predictability on something that wasnt around when your great great grandfather was born is food for thought.  <response>: Youre talking about risk in other words and again Ill reiterate that the US economy is your safest bet. Its fortunate enough to have two good neighbors between Canada and Mexico and otherwise oceans on its borders. With robust natural resources and a culture of progress, the US is already at the top of the mountain. Relatively speaking, no other economy in the world is even close to as stable and safe. Could it come crashing down? Absolutely, but every other option you have is exponentially more likely to fall apart than the US economy. 