Suppose that full employment real GDP is 100, but the actual equilibrium real GDP is 60, and the marginal propensity to consume
is 0.75. What is the appropriate macroeconomic policy to use to
bring back the economy to full employment and by how much should
the appropriate tool of the policy chosen increase?
A. Monetary policy by increasing the interest rate by 6%,
B. Fiscal policy by increasing the federal fund rate by 10%
C. Contractionary policy by increasing government spending by 60
D. Expansionary fiscal policy that increases spending by 10.

Reliability and validity reliability and validity are two important considerations that must be made with any type of data collection. reliability refers to the ability to consistently produce a given result. in the context of psychological research, this would mean that any instruments or tools used to collect data do so in consistent, reproducible ways. unfortunately, being consistent in measurement does not necessarily mean that you have measured something correctly. to illustrate this concept, consider a kitchen scale that would be used to measure the weight of cereal that you eat in the morning. if the scale is not properly calibrated, it may consistently under- or overestimate the amount of cereal that’s being measured. while the scale is highly reliable in producing consistent results (e. g., the same amount of cereal poured onto the scale produces the same reading each time), those results are incorrect. this is where validity comes into play. validity refers to the extent to which a given instrument or tool accurately measures what it’s supposed to measure. while any valid measure is by necessity reliable, the reverse is not necessarily true. researchers strive to use instruments that are both highly reliable and valid.