GGovic: You need to actually read my post. Is states that an Economist article addressed our points based immigration system, not that it addressed the poor retention rate for skilled immigrants. There are many articles online regarding the tendency of skilled immigrants to leave Canada during their working lives. You might want to read the following article from 2015, which notes that Stats Can has concluded that one-third of immigrants leave Canada within 20 years following their arrival. 

http://www.newcanadianmedia.ca/item/28097-why-some-immigrants-make-it-in-canada-while-others-leave