Dollar Tree is slashing its full-year earnings and sales forecasts as its customers continue to struggle with higher prices and spend less. Shares are down more than 10% before the opening bell Wednesday after hitting a 52-week low on the prior day. Less than a week ago, shares of rival bargain chain Dollar General had their biggest one-day decline ever after a dismal quarter. Dollar Tree has been trying to lure customers from other retailers with rock-bottom prices, but juggernauts like Walmart and Target have also said their customers are under pressure and they’re cutting prices, too.