Volume shelf analysis helps us find where buyers and sellers are. A $PLTR volume analysis anchored to december revealed a volume shelf at around 27.00 price point, this was in alignment with a minor key level. As the broke upwards today, it hit a wall of sellers at 27.00 and the price rapidly collapsed. This bounce exhausted some supply, so the next time we visit 27.00, there will be less sellers and the bounce won't be as violent.