College inflation: tuition and grades … correlation, causation or coincidence?

Couple of charts posted by Prof. Mark Perry caught my eye …

In one post, Prof. Perry charted college enrollment rates and tuitions.

Both slope upward,

Supply and demand ?


* * * * *

Keep the above red line (tuitions) in mind as you glance at the chart below: grade inflation.

The grades’ line also slopes up.

Sure looks like — as tuitions are rising — colleges are dishing out more high grades.

Cause & effect or just a coincidence?


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