According to economists, this episode of great recession was resulted from a sudden busting of house bubble in US, where the house bubble was caused by rapid growth of improper regulation on sub-prime mortgages (Merriam 2009; Wang 2009; Whitney 2007).
When working with equations that have two variables, the coordinate plane is an important tool. It's a way to draw pictures of equations that makes them easier to understand. To create a coordinate plane, start with a sheet of graph or grid paper. Next, draw a horizontal line.
This is the direction of control problem.10. When two variables are correlated it is possible that some third, unmeasured variable is responsible for the relationship because that third variable is simultaneously causing changes in the original two variables. This is the third variable problem. 15 - 24 11.