________ flexible wages and prices imply that the short-run aggregate supply curve is ________

The aggregate supply curve is vertical at the level of real GDP that corresponds to the natural rate of unemployment

a. True b. False Indicate whether the statement is true or false

If individuals who sit in the back of the classroom receive lower grades on average than the rest of the class, does that mean that sitting in the back of a classroom causes one to perform poorly on exams? a. Not necessarily. The reoccurrence of a certain relationship between two variables does not necessarily imply causation. b. It is not possible for an economist to determine causation

between variables. c. The reoccurrence of such a relationship is sufficient evidence that sitting in the back of a classroom will lead to lower grades. d. none of the above