Use the following to answer questions:
Figure: Consumer Surplus I 
-(Figure: Consumer Surplus I) Look at the figure Consumer Surplus I. If the good is free, consumer surplus equals the area:
Definitions:
T-data
This term is a shortened form for "test data," referring to information collected from psychological tests that aim to measure individual traits, abilities, or attitudes.
Factor-analytic Research
A statistical method used to describe variability among observed variables in terms of a potentially lower number of unobserved variables called factors.
Stable Marriage
A marital relationship characterized by enduring commitment and satisfaction between partners.
Apprehension
a feeling of anxiety or fear that something bad or unpleasant is going to happen.
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