>>60604960 (OP)it's caused by price compression. whenever people get really excited about bitcoin two things happen - one, people who own it cling to it tightly because every day it increases in value, making them richer. two, people who want to get in on this daily-getting-richer thing start to buy. because there is no one selling this "compresses" the rate at which price increases to meet demand. That generates the exponential "parabolic" increases which only last a few weeks. This process pushes the price much higher than it really should be, which causes those previously unwilling to sell to be willing to do so. The coiled-spring that the compression created quickly dissipates and the price drops quickly, typically over-correcting. after a few years the halvening starts the process again by reducing new supply.