How to Stop Toddler Tantrums with One Question?

Let’s face it there may be nothing worse in the world than your toddler having a tantrum in public. It usually happens when I’m shopping. My kids change from adorable little people into crazed monsters. If they see any sort of toys, candy or books they turn into a crying mess because they can’t take it home. They cry so hard I find people in the store giving me judging looks...