/ http://www.slideshare.net/images/logo.gif / ºÝºÝߣShare feed for ºÝºÝߣshows by User: surapongwongpan https://public.slidesharecdn.com/v2/images/profile-picture.png [ D R u M y ] ดรัมมี่ อร่อยดี มีประโยชน์ Economics Student Department of Economics Faculty of Management Science Khon Kaen University