Sinterklaas festivities on Saturday highlighted a bittersweet challenge: the steep increase in the cost of chocolate letters. “Chocolate letter prices are up between 20 percent and 25 percent per kilogram compared to 2023,” said Sebastiaan Schreijen, senior analyst at RaboResearch. “A Jumbo house brand letter is 35 percent more expensive, while Albert Heijn letters have risen by 13 percent,” said …