Sunk cost fallacy makes you finish the meal when you're already full. It fills your home with things you no longer want or use. Every every garage sale is a funeral for some one's sunk costs. Studies actually show that lower animals and small children, they do not commit this fallacy. Wasps and worms, rats and raccoons, toddlers and tikes don't care how much money goes to waste. They can only see immediate losses and gains. As an adult human being, you have the gift of reflection and regret.