Mental Real Estate
Definition
Mental real estate is a way of describing the amount of space one has in one's mind, and how much of it is taken up by one idea-set, brand, or other preoccupation. It could be used to describe the availability of space in one's mind, and how certain activities, inputs and preoccupations influence the space in one's mind.
Brands wage wars over mental real estate. The mental real estate that one has when the word "tissue" is mentioned is taken by "Kleenex" over "Puffs". Mental real estate of consumers of brands is the highest commodity. It is the life or death of a brand. Sometimes, whatever gets into a person's mind first is fixed in place and very difficult to remove by a later memory.
Dunbar's Number is a good way of describing how many concurrent friends you can actually have. On Facebook, neuroplasticity -- it seems like it's an augmentation in training, where you can feel you care about 500 people in tandem, but you can really only interact with 150 - that really these other people in real life have fallen off the map otherwise.