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The Stock-to-Flow (S2F) model, created by PlanB, predicts Bitcoin's price based on scarcity. It compares existing supply to new production, with critics citing
The Stock-to-Flow (S2F) model, a popular but debated Bitcoin price prediction tool, calculates an asset's scarcity by comparing its existing supply (stock) to the rate at which new supply enters circulation (flow) [2]. While proponents argue the model accurately tracks Bitcoin's price movements, critics highlight its oversimplification of market dynamics [2].
| At a glance | |
|---|---|
| Model Creator | PlanB (anonymous Twitter user) [2] |
| Core Principle | Price increases with scarcity [2] |
| Bitcoin S2F Ratio | 50 (post-halving) [2] |
| Gold S2F Ratio | ~66 [2] |
The S2F model posits that as an asset becomes scarcer, its price will rise [2]. A higher stock-to-flow ratio indicates that it would take longer for new production to match the existing supply, signifying greater scarcity [2]. For example, gold has an S2F ratio of approximately 66, meaning it would take 66 years of current gold production to equal the total gold stock in circulation [2]. Silver, by comparison, has a ratio of 74 [2]. Bitcoin's S2F ratio is 50, following its third halving, which reduced the miner reward from 12.5 to 6.25 BTC [2].
In economic terms, a stock is a quantity measured at a specific point in time, such as the total value of capital or the amount of money held [1]. A flow, conversely, is measured over an interval of time, like income per year or investment per quarter [1]. The ratio of a stock to a flow yields a unit of time; for instance, the debt-to-GDP ratio can be interpreted as the number of years required to pay off debt if all GDP were allocated to repayment [1].
The S2F model's creator, PlanB, an anonymous Dutch institutional investor, claims the model suggests Bitcoin could increase tenfold in value over the next few years [2]. This projection has drawn significant attention, with some believing it has influenced institutional investment in the cryptocurrency space [2].
However, the model faces substantial criticism. Opponents argue that it oversimplifies the complex interplay of supply and demand, making it an unreliable basis for investment decisions [2]. While Bitcoin's volatility has decreased from early days (when daily returns could fluctuate by 15%) to a typical 2-4% in recent years, predicting its price remains a challenging endeavor [2]. Commentators hold widely divergent views, with some predicting Bitcoin's value will fall to zero, and others seeing no theoretical upper limit [2].
The stock-to-flow model provides a framework for understanding Bitcoin's scarcity, but its predictive power remains a subject of ongoing debate among analysts and investors.
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AI-assisted synthesis by the TrendWatcher Editorial Desk · sourced from 2 outlets · Aug 24, 2026 · How we report
It is a mathematical ratio calculated by dividing the total existing supply of an asset (stock) by the amount of new supply produced annually (flow).
Halving events reduce the block reward for miners by 50%, which lowers the annual flow of new Bitcoin and increases the S2F ratio, theoretically signaling higher scarcity.
While it was influential in earlier cycles, its predictive accuracy has weakened as Bitcoin's price has frequently deviated from the model's projections, leading many to use it as a historical reference instead.
The model is applied because Bitcoin has a limited, code-defined supply schedule, making it comparable to scarce physical commodities like gold.