When x and y are real variables, the derivative of f at x is the slope of the tangent line to the graph of f' at x. Because the source and target....yada, yada, yada....I got a D in calculus but A's in economics, finance, and psychology.
Which qualifies me to advise you to "Beware the purveyors of the second derivative". These are the people who tell you that they are seeing positive indicators in the economy. What are the measuring? They are measuring the change in the change.
And, you should know that even when the change in the change is positive, it can still be negative.
Class, Dismissed!
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