Now Playing: 09-18-12 Marketplace Mid-day Update

Mitt Romney said 47 percent of Americans pay no income taxes. What are the numbers behind that comment? We take a look at what's going on with oil prices, why sales of Apple's iPhone 5 may help shipping companies, and explore the reasons behind the rise in transit ridership. Plus, researchers have found that there are more jobs than expected that pay between $35,000 and $72,000 without a university degree.