The average US grocery size is shrinking as retailers such as Wegmans Food Markets and Publix Super Markets try out smaller formats in the face of rising real estate and construction costs and a wider adoption of online shopping. Meijer will open its first smaller Meijer Grocery concept this month, which will come in at 75,000 to 90,000 square feet rather than the 220,000-square-foot stores the company normally operates. Progressive Grocer