G. Thus, the amazing result that only the intersection of S and D is stable. That is why we call it the equilibrium price - it is the only price that markets don't tend to move away from. It shows the difference between consumers' maximum willingness to pay, and the amount they actually paid. It shows the difference between the minimum producers were willing to accept, and the amount they actually got. There are four kinds of shifts that can happen.
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F. Shifts versus movements along a curve. Students often have trouble translating changes correctly. How to tell the difference. Think about whether the posited change makes people WANT a good more or less. If so, it's a D change.