Was listening to Marketplace Money today (7/23, I believe it was the 7/22 show. A caller who is a university professor with consulting income was asking about retirement investing.you commentator asked if he had a 401k at the university and suggested that, if I heard correctly, that she put all the money in a single account to take advantage of improved compounding. While here may be advantages to having larger accounts (lower fees) which could translate to improved returns there is no other inherent advantage from the point of compound interest by having all eggs in one basket. $100,000 dollars invested in one account should return the same as that amount invested in two or more accounts. Investors should weigh fees and relative risks when deciding were o put their money.