Shopping at dollar stores is becoming an increasing part of American life, according to ACNielsen U.S.. An ACNielsen Homescan consumer panel analysis found that 52% of U.S households shopped at dollar stores such as Family Dollar, Dollar General and Dollar Tree in 1999, up from 47% in 1998.Although dollar stores are concentrated in rural areas and in the South, they have penetrated all census regions. Among so-called “heavy” dollar store shoppers (the 33% of customers who account for...