One example is from 'The Necklace'. The main character, Mathilde, is greedy for a luxurious life. She borrows a diamond necklace to attend a ball, thinking it will make her look more glamorous. But she loses the necklace. To replace it, she and her husband have to work hard for years to pay off the debt. Her greed for a moment of luxury led to years of hardship, clearly showing that greed is a curse.
In the story of 'Faust', Faust is greedy for knowledge and power beyond human limits. He makes a deal with the devil. As he gets what he wants in terms of knowledge and power, he loses his soul in the process. His insatiable greed for more than he should have led to his eternal damnation, which is a very strong example of how greed can be a curse in a long and complex story.
The fable of 'The Goose that Laid the Golden Eggs' is also a good example. The farmer was greedy. Instead of being content with the one golden egg the goose laid each day, he wanted all the gold at once. So he killed the goose, only to find there was no more gold. His greed made him lose the regular source of wealth, which was a curse brought on by his own greed.