Now Playing: 02-18-13 Marketplace

On this President's Day holiday, we explore whether it's legal to use images of presidents for commercial purposes. Are you planning to eat some potatoes today? The state of Idaho is worried about knock-off potatoes, specifically from Turkey. Plus, we look at India's gun market, why it's so hard to refinance student loans, and how robots may steal our manufacturing jobs. Also, what would it take to get you to leave some change in the tip jar? A strategy to get people to leave that extra dollar.