Normative statement
What ought to be
Positive statement
What actually is, was or will be
Where economists work (5)
Theory
abstraction of reality
Theory consists of… (3)
Endogenous variable
Dependent, can be explained within a theory
Exogenous variable
Independent, outside a theory
The variables that interest economists are generally influenced by…
Forces that vary simultaneously
Positive correlation
X and Y move in the same direction
Negative correlation
X and Y move in opposite direction
Is correlation a direct evidence of causal relation ship?
No
Randomized controlled trials (RCT) approach
Helps determine underlying causality among economic variables
Value of a base period
100
CPI formula
(Absolute value in given period / Absolute value in base period) x 100
Basic forms of single economic variable (2)