Can you trade comodities such as Gold, Silver, Oil, etc using an online brokerage and a Roth IRA?

My online brokerage is TradeKing. Up until now I’ve only traded stocks and options, but I’m interested in broading my horizons to new types of investments. I’m just wondering if I need a new account, or if I can do this with my current brokerage.

Is it possible to invest in 401k using precious metal commodity?

With the news of uncertainty about the state of financial market in terms of stability, and when it does hit the market hard, the banks facing the catastrophe will not allow withdrawal of cash from the individual and business accounts, will the holding of precious metal in the deposit of the trustworthy holder (mutual fund […]