I believe it was from May to September 1787, in Philadelphia, Pennsylvania.
The correct answer is "they are very profitable for owners, but usually result in dissatisfied producers and consumers.
The reason for this is because a monopoly controls all commerce in that particular market. When a monopoly has control, it can decide what prices to sell its goods, and often leaves buyers/consumers dissatisfied.
Indoctrination means teaching a person to accept a set of beliefs without questioning them.
Hope it helps!
