Now Playing: 11-28-12 Marketplace

President Obama is asking Americans to speak out about the fiscal cliff and middle class tax cuts by using the hashtag #My2k on Twitter -- but how much influence can a hashtag have? In the wake of news that Jeff Zucker could soon lead CNN, we dissect how the news channel has been doing. Britain's government has set a minimum price for alcohol to help combat excessive drinking. Freakonomics Radio's Stephen Dubner talks about pro bono economics. And in the last part of our series on Walmart and labor, a look at how organized labor is trying to hold marquee retailers responsible for the low-wage workers who move their goods.