A trader hands a customer a bag of fresh vegetables from her stall which displays large price signs in Latvian lats at the city’s central market in Riga, Latvia, on Monday, Dec. 9, 2013. The country of 2 million will become the 18th member of the euro area in January after transforming its finances and recovering from the world’s deepest collapse in output four years ago. Photographer: Jason Alden/Bloomberg