An individual who leaves one region to profit from the economic prosperity of another region. Generally, economy leeches have no marketable skills and and therefore contribute very little to the well being of their new environment. They arrive in droves and their presence usually results in a steep increase in rent prices. Economy leeches usually appear disoriented in traffic, and can be identified by their out-of-province license plates and their constant whining about social problems, which they themselves have caused.
In Alberta, economy leeches are sometimes called Buffalo Hunters, in reference to the 19th European settlers who raped and pillaged the bison population of the prairie provinces for their precious hides.
I was totally late to work today. I was driving behind some newfie economy leech who drove 20 under the limit because he didn't know where he was going.