[bigtimeidiot]

>Anyone have a good source for that number?

You can get close with a few ETFs: US market and bonds, Ex-US global market and bonds:

http://www.pragcap.com/a-simple-four-fund-global-financial-a...

[pedrocr]

Those are ways to invest in that total number. I already do that. I mean an information source for the total valuation of the world's stock markets on a monthly basis at least.