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How crypto cycles have worked

Lesson 2 of 5
By the end of this lesson you’ll be able to date four of bitcoin’s big falls, say what came with each one, explain why the halving story carries less than people think, and know what a cycle can and can’t tell you about what you hold.
A collage of a sandcastle the size of a cathedral on a wet gray beach, with tiny men in suits and bowler hats on ladders patting its walls and a deep blue flag on its highest tower. Behind them along the shore stand three slumped mounds of sand, the remains of earlier castles with ladders still stuck in them.

Four falls, from one series

Crypto from Zero lesson 5 gave four of bitcoin’s falls of more than half, in Coinbase’s daily closing prices, as published by the Federal Reserve Bank of St. Louis. Here they are again, on one dated line.

A dated line from December 2017 to November 2026 with four rust lines dropping from it, each to its depth. From December 2017, 84 percent, to December 2018. From February 2020, 52 percent, to March 2020. From November 2021, 77 percent, to November 2022. From October 2025, 53 percent so far, to June 2026, marked as the lowest close so far with a hollow dot. No recovery is drawn.
Each fall, from its peak to its lowest close so far. The same series holds other falls of more than half, including 53 percent from April to July 2021, which this lesson leaves out.
$19,650 on 16 December 2017 to $3,183 on 15 December 2018: 84 percent.
$10,380 on 14 February 2020 to $4,980 on 12 March 2020: 52 percent.
$67,510 on 8 November 2021 to $15,756 on 21 November 2022: 77 percent.
$124,720 on 5 October 2025 to $58,586 on 30 June 2026, the lowest close so far: 53 percent so far.

On 5 November 2026 bitcoin closed at $76,153, 39 percent below its 2025 peak.

These dates record what bitcoin did and set no schedule. The 2025 peak may never come back, and the record promises nothing about any coin from here.

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