2014 was a big year for the battle over minimum wage. In November, voters in four states passed referendums to raise their state minimum wage above the federal level of $7.25 an hour. In December, Chicago became the latest city to set a higher minimum wage for workers, and next year, higher wages take effect in Hawaii, Maryland and West Virginia. Here to discuss this growing trend is reporter Josh Eidelson, who covers labor and politics for Bloomberg BusinessWeek.