Should you take investment advice from a robot? For Jon Stein, CEO of robo-advisor firm Betterment, the answer is a resounding yes. Robo-advisors are algorithms that recommend investments based on one’s investment preferences, risk tolerance and financial goals with minimal human interaction. Using this technology, robo-advisors cut the cost of traditional wealth management to the masses. Stein talked about this rising trend in the investment management industry on the  Knowledge at Wharton Show, which airs on Sirius XM channel 111 . He was joined by Olivia Mitchell , executive director of the Pension Research Council , who is also director of the Boettner Center for Pensions and Retirement Research at Wharton.  An edited transcript of the conversation follow.     Knowledge at Wharton: When we’re talking about investing and people saving for retirement, would you say that we shouldn’t be surprised to see more use of robo-advisors and technology?…