Dr. Marc Faber , The author of the Gloom Boom & Doom Report warns that the world will face "massive wealth destruction" caused by either inflation or social unrest. "Well to-do people will lose up to 50% of their total wealth," he adds. Investors, particularly those in the "well-to-do" category, could lose about half their total wealth in the next few years as the consequences pile up from global government debt problems,