Editor's note: The following are questions received from listeners of "RealMoney Radio." To send Cramer a question about topics from his radio show, click here. Listen to Cramer's latest radio show by clicking here. Jim, why isn't Citigroup (C) rallying off of Goldman Sachs' (GS) great earnings? -- Donald from Long Island James J. Cramer: Citigroup is much more diversified than the brokerage houses, and plain-vanilla services like branch banking aren't as hot as investment banking business lines like merger advisory and trading. I think Citi is doing well in brokerage, but the sheer diversity of the company hides that strength. Do you like Electronic Arts (ERTS)? -- Marcus from Los Angeles James J. Cramer: I see Electronic Arts as a good long-term investment, though the next year is almost certainly going to be rocky for the company. I believe that EA has the best video-game franchises. Plus, consolidation in the business, driven by higher software development costs, could also benefit this industry superheavyweight. Want more Cramer? Check out Jim's rules and commandments for investing from his latest book by clicking here.