[imgbelt img= ASD-107.jpg]Organic groceries cost nearly 40 percent more than store-brand items, but the market for organic foods continues to increase, a study finds.The study by IBISWorld says the average cost of a cart of store-brand groceries in the United States is about $100, while organic groceries cost $140.Is the price difference worth it? Consumers think so. The market for organic groceries has increased by 4 percent this year. But consumers are more apt to buy organic or natural products when the prices are comparable to traditionally produced groceries, a separate study says.And an online publication that covers traditional production agriculture called the price difference in the IBISWorld study “staggering” and argued that there’s no nutritional difference between organic and regular groceries.