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Usually, we have two variables.
Fermat considered an equation among two variables.
Two variables viz.
"We can correlate any two variables.
You rarely see two variables this closely linked.
Here, you have two variables of integration.
These paths represent tradoffs between two variables.
The Romers look at two variables: inflation and output growth.
We just use two variables and set up everything in terms of these two variables.
PIERRE HUMBERT:—The symbolical calculus with two variables.
Correlation, especially between just two variables, doesn't show causation.
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