Complex sentence: A common misconception on scarcity is that an item has to be important for it to be scarce.this is not true, for something to be scarce, it has to be hard to obtain, hard to create, or both.
Split into simpler sentences: A common misconception on scarcity is that an item has to be important for it to be scarce. However, this is not true, for something to be scarce, it has to be hard to obtain, hard to create, or both.