Hershey's has once again managed to fend off the takeover efforts of a rival. On Monday, Mondelez, the snack company, said it had abandoned its pursuit of Hershey's, becoming the fourth company to have tried - and failed - to buy the chocolate-maker. Here, Ed Hammond and Craig Giammona discuss what makes Hershey's such a tough takeover target and look at the broader trends in food M&A.