The correct answer is: "low-wage work force ".
Many corporations decide to invest in developing nations because they can enjoy cheaper factors of production there.
The outsourcing practice has become very common. When a company from a developed country decides to outsource some or all its manufacturing activities, it seeks to reduce its production costs, because in less-developed countries factors of production are generally cheaper (land, labor, capital), there are less strict legal requeriments for companies, etc. This allows corporations to produce more efficiently and to become more competitive in the international markets.