This is the primary factor that explains why people are not good listeners.

A factor in which will explain why people are not good listeners is when a person usually prepare an idea or which they prepare the thought that will come next and in the same time pretending that they are listening.

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.