However, purchasing organic products is not nearly as expensive as many believe. The Eco-Institute in Freiburg (Germany) calculated that the average additional cost of buying staple foods of organic quality amounts to only 40 Euro more per month for a middle-income family of four (515 DM instead of 475 DM). The model calculation included milk, butter, eggs, potatoes, wheat flour, rice, pasta, bread and even coffee and bananas. If at the same time the consumption of meat, meat products, sugar, sweets and jam are reduced, the total costs are nearly the same (11). And so "to buy organic food would cost a family 8% more than buying conventionally produced food."
Source: Schneider, Manuel, "Myths in Agriculture: Arguments for Organic Facts to counter prejudice, misconception and ignorance," 2nd extended edition.