Portfolio Design - choosing the right mix of assets appropriate to a particular investor - is the key to successful investing. It can help you accumulate wealth over time, while cushioning the blow of possible economic downturns. But in order to successfully achieve this goal, you need to be familiar with all of the major asset classes that go into modern portfolios and learn how much they add to portfolio diversification. Thoughtful asset allocation provides discipline to the investment process and gives you the best chance of building and safeguarding wealth. Wharton Professor...