Utah lawmakers have voted to stiffen penalties on retailers who chronically overcharge customers.

The new state law, which takes effect on 6 May, was introduced in direct response to a Guardian investigation of pricing practices at two national chains, Dollar General and Family Dollar, according to an official who oversees the state’s price-accuracy inspections.

Both dollar-store chains target cost-conscious families, yet their stores often post one price on the shelf and ring up a higher price at the register.

The investigation, published in December, found that Dollar General stores failed more than 4,300 government price-accuracy inspections in 23 states between 2022 and 2025. The smaller Family Dollar chain failed more than 2,100 price-accuracy inspections in 20 states during the same period.