Target says a small percentage of the gift cards it sold won't work properly — more bad news following on the heels of a security breach affecting some 40 million credit and debit cards. Justin Sullivan/Getty Images hide caption

itoggle caption Justin Sullivan/Getty Images

Chris and Sara Guerre are among a growing number of farmers who have made the choice to rent land to farm instead of buy because of increasing property values. Zac Visco for NPR hide caption

itoggle caption Zac Visco for NPR

Students at the Oakland Military Institute took several courses offered by San Jose State and the online course provider Udacity this year. The university is now scaling back its relationship with Udacity. Laura A. Oda/MCT/Landov hide caption

itoggle caption Laura A. Oda/MCT/Landov

Carlos Slim Helu (left) talks with Steve Forbes of Forbes magazine. The magazine lists the Mexican telecom mogul as the world's richest man, with a net worth of $73 billion. Jeremy Piper/AP hide caption

itoggle caption Jeremy Piper/AP

Twitter made its debut on the New York Stock Exchange in November. Both the social media giant and the relative newcomer Snapchat are valued in the billions, but neither company has yet turned a profit. Emmanuel Dunand/AFP/Getty Images hide caption

itoggle caption Emmanuel Dunand/AFP/Getty Images