Competition is intense in the dollar store segment, with Dollar Tree ( DLTR) competing directly with FDO.

FORBES: Move up http://i.forbesimg.com t Move down

One of the best-performing retail stocks is Dollar Tree ( DLTR), which broke through two-month resistance, line e, on Monday.

FORBES: Retail Sector Is on the Move

Other discount retailers that have begun to pullback from recent highs include Family Dollar (FDO) and Dollar Tree (DLTR).

FORBES: Wal-Mart And Dollar Stores Look Ripe For Oversold Bounce