EVEN before the economy tanked, discount stores, or dollar stores as Americans call them, were looking healthy. Now their profits are rising like helium-filled balloons. Dollar Tree, a Virginia-based chain of dollar stores, had sales of more than $1.39 billion in the fourth quarter of last year, a 6.8 % increase over the year before. For the whole of 2008, Dollar Tree, which has been in business since 1953, notched up record sales of $4.64 billion.

Family Dollar is prospering, too. The market value of this company, based in North Carolina and with more than 6,600 stores in 44 states, rose 36% last year. Other dollar-store companies have also reported big profits.

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