<prompt> Human: Or is it better to create a portfolio that contains more assets, in order to perform in down times?  <response>: Thats the 500 biggest companies. Thats most of the stock market.When the SP500 goes down, almost every other domestic stock fund will also go down.If you want to add anything, it would be bonds andor international. These can help a bit, but they have their own issues.Read more: 