Answer:
Non-standard works.
Step-by-step explanation:
According to BBC News, the gap between rich and poor keeps growing.
The Organisation for Economic Cooperation and Development (OECD) says that one of the factors that causes inequality growing is non-standard works. This includes temporary contracts and self-employment.
But, economic gap is a complex problem that can't be explain that simple, it really is a multidimensional problem, since that involves several variables like ineffective distribute of incomes, even some people blames globalisation.