Why does demand only usually go up when the price is lowered?

There are many reasons of falling demand instead of constant price such as

1. Demonstration Effects

2.Change in fashion

3.Due to heavy competitions in market

4. Lack of innovations

5.Poorly designed policies and their implementations

6.Low quality of products.

7.Lack of incentives to costumers

8.poor management of business relations with consumers.

9.Non branded launching of products

10.Monoplistic business snerio.