Useless and pointless knowledge

There's a Micro assignment due tomorrow. I've kinda neglected it while preparing simultaneously for two Growth presentations (and worrying unproductively about the Metrics test). Now I'm doing the assignment, and it's not making me happy.

The dual problem to "minimise y subject to x ≥ c" is "maximise x subject to y ≤ d". It is not "maximise p × x subject to f(y) ≤ d". Now that I've realised this, progress may be more progressive.