Three college graduates—one in Math, one in Engineering, and one in Economics—sit for a job interview.

The question they’re all asked is “What’s 2+2?”

The Math graduate goes to the whiteboard, fills it with a proof, and concludes that, “A solution exists.”

The Engineering graduate consults his addition tables, writes some calculations down, graphs his results, and says, “3. But we’ll make it 5 just to be safe.”

The Economics graduate locks the door behind him, closes the curtains over the windows, and finally whispers, “How much do you want it to be?”