Silver hit the highest in decades as a historic short squeeze in London intensified, with a fresh surge in prices adding urgency to a worldwide hunt for bullion that could alleviate the mismatch between demand and supply. Spot silver climbed as much as 3.1% to near $52 an ounce, exceeding last week’s peak, while gold surpassed$4,070 an ounce, building on a record-breaking run of eight weekly gains. Platinum and palladium also surged, amid signs that market stresses caused by surging investor demand are ...