The latest four weeks food, drug, convenience and liquor case volume through March 20 was off 1.8%, says Nick Lake of Nielsen. But with a switcharoo: Supermarket case volume was off 2.4% and cfonvenience case volume was off "only" 1.6%. Another switcharoo: Previously dollars typically were ahead of cases, but now on a dollar basis the category was only up +0.1% across all channels, suggesting weak pricing and trading down