Most product line extensions do not stray far from the original offering. For example, video games are commonly extended into movies, as shown by films like Mortal Kombat and Lara Croft: Tomb Raider. Similarly, television shows regularly prompt board game extensions, like the Simpsons® Monopoly® edition. Even the wildly popular internet video 'What Does the Fox Say?' is now being turned into a children's book! All of these examples are very natural extensions of the original product, because they fall under the general category of entertainment. This kind of closely-related extension is considered same-dimensional.

Rarer are extensions which are new-dimensional,   More...