If you are hungry or tired, or if you are in an especially hot or cold environment, you might find it difficult to listen because of what is generally termed

Noise

Explanation:

Noise refers to anything that disrupts or affects the process of communication between a speaker and a listener/listeners. Noise can be either external (a physical sound), or internal (a disturbance in the mind).

There are 4 types of noise:

Physiological noise: it originates because a person is hungry, tired, has a headache, is taking medication, or there is some other factor that influences his/her perceptions.Physical noise: it comes from the environment, like the noises people make, extreme temperatures, and places with many people. Psychological noise: it indicates that a person has some qualities that influence the way he/she communicates and understands what other people say.Semantic noise: it takes place when there is a problem of comprehension of words between two or more people.

*blinks* youforgotyourname**

Complementary goods. they go together, thats why one price increase and the others demand increases