title: Can I change my app from free to paid or from paid to free any time?
body: <p>I am about to submit an app to the app store for approval. I have a question regarding the app price. </p>
  
  <p>Can I change the app from paid to free or from free to paid at any time? I have noticed that some paid apps have a promotion were the app is free for a limited time and I am considering using the same strategy if I can research it enough .</p>
  
  <p>If I first write a free app and it's approved by App Store, can I sometime later change it to a paid app? </p>
  
  <p>If I can do so, how does app store process the update? For example, if a user downloads my app when it's free can they update the app later when it is no longer free?</p>