The federal agency, which insures deposits and disposes of failed banks and their assets, will add 125,000 square feet to the 185,000 square feet it rented last year at 1601 Bryan St., a 49- story tower in downtown Dallas. That agency will add about 300 staff at the building, including some of the 69 retirees it is bringing back to help handle the increased workload, said spokesman Andrew Gray.

Mr. Krugman received the award for his work on international trade and economic geography. In particular, the prize committee lauded his work for “having shown the effects of economies of scale on trade patterns and on the location of economic activity.” He has developed models that explain observed patterns of trade between countries, as well as what goods are produced where and why. Traditional trade theory assumes that countries are different and will exchange different kinds of goods with each other; Mr. Krugman’s theories have explained why worldwide trade is dominated by a few countries that are similar to each other, and why some countries might import the same kinds of goods that it exports.