I came across this video on youtube, for a more clear view on supply and demand, i thought it would be helpful to other community members as well. So, i decided to share it here with you guys 
.
https://www.youtube.com/watch?feature=player_embedded&v=PEMkfgrifDw
[video]https://www.youtube.com/watch?feature=player_embedded&v=PEMkfgrifDw[/video]
                        
                    
.https://www.youtube.com/watch?feature=player_embedded&v=PEMkfgrifDw
[video]https://www.youtube.com/watch?feature=player_embedded&v=PEMkfgrifDw[/video]