The correct answer should be an implicit idea found in things such as allegories. It's like watching a fable, it's not really about the animals but rather it has a meaning that is understood by us and that is implicit, not explicitly said. Implicit ideas are common and are used in almost all works of art, from writing to painting to sculpting.
In 1819, the spectacular post-War of 1812 economic growth concluded. Banks throughout the country were collapsed; mortgages were ruled out, individuals were forced to leave their houses and off their agricultural farms. Falling costs impaired agriculture and producing, unemployment covered the whole country.