To be fair, OP never specified and creative thinking has taught us an answer can be seen outside the box. The worst candy purely on say an economic standpoint is the one that costs you the most and that people tend to want to take more than one if you let them, making them disappear sooner and the $/candy the most expensive.
My fellow researchers, we must investigate and plot it against a $/Sneaky Fucks Taking More than One graph.
My fellow researchers, we must investigate and plot it against a $/Sneaky Fucks Taking More than One graph.