Treasuries

If you are 90% stocks, then go 10% long term treasuries.

If you are 80% stocks, go with 20% intermediate/long term treasuries

If you are 70% stocks, go with intermediate term treasuries

If you are 60% stocks, go with TBM, which is intermediate term, but also a slightly lower bond rating since corporates are mixed in.

or put a different way: The idea is - long term bonds when you’re young (recession/depression is your enemy), TIPS when your retire (inflation is the enemy).

so Long Term treasuries are good for deflation, decreasing interest rates and are 99.99% safe :)

source: [https://www.bogleheads.org/forum/viewtopic.php?t=2409&mrr=1265740503]