Answer:
I feel Chang must work hard on the promotion part of the P.
Explanation:
And that requires a very broad range of marketing, and top-quality branding for luring more users to use the app. And the competitors are selling for free and the product is same as well, and he cannot do anything with the place as the competitors have launched their app on play store. Hence, it’s the promotion that is most important, and at large scale as competitors are selling their apps for free. So, Chang need to prove that his app is better through large scale promotion.