changing the prices of publication?

helo, im starting @ this,  have 1 question:

 

can make time paid publication free, doing in app store promos?

 

thanks!

it's not idea switch folio between free , retail. here couple of articles creating free promotional content:

 

http://helpx.adobe.com/digital-publishing-suite/help/methods-offering-free-content.html

http://www.adobe.com/devnet/digitalpublishingsuite/articles/new-ways-promote-content.html

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