"Parcels of land are valued at $50,000 each. However, when two of the parcels are joined, they are valued at $120,000. What economic principle is at work here?"

Plottage

Explanation:

Plottage also referred to assemblage is when two or more adjoining lots are merged into one large lot. The purpose is to increase the value of the single or individual lots because a larger building which is able to generate larger net return may be built on the lot.

Plottage is an increase in the value of a property which is as a result of joining two neighbouring parcels of land. For example, if Mike owned a number of lots which are next to each other, he could combine two or more together to form a single lot.

answer; i believe that the correct answer is client agreement;