We limit ourselves to two periods in the intertemporal model of ...

[AEWBW]

We limit ourselves to two periods in the intertemporal model of the business cycle because
 
  A) we need to concentrate on the two phases of the business cycle.
  B) we can assume that people can live two periods of, say, 30 years.
  C) this is all we need to emphasize the intertemporal trade-off.
  D) we need an even number of periods.

Question 2

Forecasting the future path of real GDP by exploiting past statistical relationships
 
  A) is never very reliable.
  B) can be accomplished by the construction and use of an index of leading variables.
  C) can be accomplished by the construction and use of an index of lagging variables.
  D) can be accomplished by the construction and use of an index of coincident variables.

[Kedrick2014]

Answer to Question 1

C

Answer to Question 2

B