For one week from 31 July 2023, the discount supermarket Penny charged wahre Preise, true prices, for nine of its more than 3,000 products. Scientists from the Technische Hochschule Nürnberg and the University of Greifswald had calculated the prices. They added the costs that food production causes for soil, climate, water and health. Maasdamer cheese became 94 percent more expensive. Vienna sausages became 88 percent more expensive. A vegan schnitzel rose by only 5 percent. Penny said it would give the extra revenue to a project for climate protection and family farms in the Alpine region.