One-third of your wealth should be in securities, one-third should be in real estate, and one-third should be in jewelry and art. So went an investment maxim of the Rothschild family, “arguably the most successful (in a financial sense) in history.”Securities, especially stocks, are the best, both from the buy side and the sell side. Buying securities online in my Bank of America account would be commission-free. I just listed my house for sale at a 5% commission. For commercial real estate, it can be 10%.  ...