External Linking & Your sites Link juice

[jpf566]

Hey guys, quick question. Does a page lose link juice when it gives link juice? If I link to an outside site, do I lose that same amount of link juice or is it just applied to there site and not removed from mine?  I understand that linking to a competitor can in turn help him and hurt me (if he then is seen as more relevant than me to google) but does it have a direct relation to hurting/removing my page link juice? Hope this all makes sense. Thanks