Cash "has the lowest return, guaranteed almost to have the worst return over the longer period of time," he said bluntly. "It's the worst investment over a long period of time because inflation will eat it away." During a recent appearance on The Diary of a CEO podcast (1), Dalio called cash the "worst" long-term investment. Here's where their money is actually goingAn income-producing inflation shieldGold isn't the only asset investors turn to during inflationary times. Simply answer a few questions about your savings, retirement timeline and overall investment portfolio.