Grocery Marketing

ST. PETERSBURG, Fla. -- Four chains have joined an in-store electronic marketing network, operated by Catalina Marketing, here.os. Markets, Colton, Calif., with 111 stores in southern California.Two divisions of Penn Traffic Co., Syracuse, N.Y., also rolled out the system: P&C Food Markets, also of Syracuse, and Quality Markets, Jamestown, N.Y., with a combined 114 stores in upstate and western New