Why does the monk's tale fit the category of parable

the monk's tale fits the category of parable because, it tells the results of different people's good and bad behavior.

The Monk tale is a series of tragedies which represents the news that the wealth and position is just an illusion. He refers through the example of many falling from high to low end, such as the example of Lucifer falling from heaven. Through such example and stories, he continues to show the people who have fallen from grace.