For example, a widespread rule in the construction business states that a customer can expect two of the following three things: speed, quality, and price. You can get good quality built quickly, but it will cost you. You can get something built fast and cheap, but the quality will suffer. Or you can get good quality for a competitive price, but the wait will be painful. This is also known as the impossible triangle. Itâs considered irrational; to ask for all three.