Answer:
decrease and demand curve will shift to the left.
Explanation:
When new firms enter a monopolistically competitive market, the economic profits of existing firms will decrease. This is because, new firms enter an existing market if they spot a profit opportunity . The entry of these new firms will therefore increase the quantity of products or services supplied in the market which gives consumers more choices and substitutes. As a result, the demand curve of the existing firms will also shift to the left. because their
