If you aren't rich in Wal-Mart stock today, then according to this model, you wouldn't be able to go back and buy Wal-Mart stock. "Something" would prevent that.
Hey people, I just tried it and this article is baloney. What happens is you get thrown into a parallel alternate universe that exists by virtue of your meddling.
I don't think I'll miss my original universe though-- I mean, I can live without President Gore and the Pope divorcing her third husband.
Maybe you could go back and invest in Walmart stock, but put it in a trust that you cannot get to until AFTER you left the present....
Or something like that.
susie