PlanB and the Bitcoin Stock‑to‑Flow model explained

Bitcoin’s price hovered just above $70,000 on March 5, but pseudonymous analyst PlanB’s latest Stock‑to‑Flow (S2F) outlook still targets an average of $500,000 for the 2024‑2028 halving cycle and flags a greater‑than‑50% probability of a drop below $61,000 in the near term [1][4].

Who is PlanB and how the S2F model works

PlanB is a well‑known Bitcoin analyst who popularised the Stock‑to‑Flow valuation framework, which measures scarcity by dividing the existing supply (“stock”) by the annual mining output (“flow”). Each halving halves the flow, and the model historically links lower flow to higher price [2]. PlanB’s 2024‑2028 projection suggests the average price could reach $500,000, with the dotted S2F line pointing to that level around 2027 [1]. He cites past successes—buying at $400 in 2015 and correctly forecasting a rise to $55,000 in 2019—to bolster credibility [2].

Current market context and short‑term outlook

Bitcoin’s price is currently testing two structural supports: the realized cost price (≈ $55,000) and the 200‑week moving average (≈ $58,000) [1][3]. While these levels have held, PlanB warns that the data do not yet show a clear cycle bottom, and there is a > 50% probability of a breach below $61,000, potentially testing $53,000 [4]. The RSI sits at 49, which PlanB interprets as a shift into a downtrend [3]. Despite the volatility, he still views the $67,000‑$73,000 range as “extremely favorable for buying” under the S2F framework [2].

Model criticism and uncertainty

PlanB acknowledges that the S2F model has faced criticism for ignoring demand‑side factors and focusing solely on supply scarcity [2]. He also notes that the typical post‑halving peak pattern—usually occurring in the first or second year—has not materialised after the 2024 halving, suggesting a possible shift in the four‑year cycle template [3].

What to watch

• $61,000 and $53,000 – key downside thresholds highlighted by PlanB’s probability analysis.
• 2024‑2028 halving cycle – the S2F model’s price path hinges on the next halving’s impact on new supply.
• Realized cost price and 200‑week MA – if Bitcoin falls below these levels, it could signal a deeper correction.

PlanB’s S2F model remains a focal point for Bitcoin’s long‑term narrative, but the near‑term risk of a sub‑$61,000 dip underscores the market’s volatility and the need for close monitoring of technical and on‑chain signals.