Mutual funds are on the blockchain through a service called @spinvest.
You can get started with these mutual funds which have been earning an interest rate at about 20% with only one token, and one token costs only 1.2 STEEM which at the time of writing this is $0.18 USD. You can't even buy a soda for that amount, but you can become an investor.
This is one of the most impressive parts of the blockchain for me. Even a work at home mom who makes her $$$ freelance writing and covers her bills as best she can has the ability to be an investor. Thanks to the service, I now am a part holder of an account that is the size of an orca. We own tokens, we own, bitcoin, and we are soon to own silver and other precious metals.
If I were to try to invest in mutual funds using fiat, I would need at least $1000USD to get started. If I had an extra $1000 to invest, I probably wouldn't, as my money would be invested in something like windows for my home first.
My first investment was buying 10 tokens. At that time, it cost me 10STEEM which I paid for with my writing.
Writing rewards on the blockchain in and of themselves are not so impressive, but invested blockchain rewards, are pretty amazing.
As of now, I have purchased 130 tokens and have received 0.5 tokens in payouts. If I do not purchase any more tokes, and the rate of investment continues as it has, in 29 years, when I am ready to retire (a weird concept for someone who doesn't really "work" and makes their income in a way that in enjoyable to them) then I will have earned $25,684.17 in interest.
Let's pretend that in 29 years when I am ready to "stop working" steem is worth $10USD, that will be over $250,000 USD - a nice little nest egg for someone who invested less than $25 USD - and earned the $$ used by writing on the blockchain.
These charts were made on this site a tool I learned how to use by being part of the spinvest team.
If you are interested in taking a look at the program: https://steemit.com/spinvest/@spinvest/steempower-invests-update-post-with-6-new-charts-included
You get regular updates, and learn more about investments as you go.
How are you investing your steem earnings?
PS. I am on the steemleo interface and LOVING the banner that is waving on top letting me know how the markets are looking. Makes me want to look at Basic Attention token which is the only one looking like its in the green.