> Supply and demand are worse. They [...] almost always break down in real world situations.

> For example: more supply can generate more demand. Demand can be inflexible with respect to supply. Supply and demand are unstable and can change unpredictably. In a monopoly situation price can be manipulated. Short term large supply can hamper long term.

Supply and demand do not "break down" in any of your examples. You literally wrote how supply and demand apply in each of your examples. It is simply wrong to say they "break down".