Billionaire investor Jeremy Grantham on crypto: A useless, speculative mechanism

CNBC TelevisionAbout 4 min readJun 26, 2026Watch original
THE SUMMARYAI-generated

Key Concepts

  • Speculative Asset: An asset with high risk, where the price is driven by market sentiment rather than intrinsic value or cash flow.
  • Proof of Work (PoW): The consensus mechanism used by Bitcoin to validate transactions, which the speaker dismisses as "unnecessary work."
  • Intrinsic Value: The perceived fundamental worth of an asset, which the speaker argues Bitcoin lacks because it pays no dividends and has no physical utility.
  • Market Melt-up: A dramatic and unexpected increase in the price of an asset or market, often driven by investor sentiment rather than fundamental improvements.
  • Green Tech Investing: A thematic investment strategy focused on sustainable technologies, which the speaker notes can be subject to high volatility and political risk.

1. Perspectives on Cryptocurrency

The speaker maintains a staunchly bearish view on Bitcoin and the broader cryptocurrency market, characterizing them as "useless speculative" assets.

  • Lack of Utility: The speaker argues that Bitcoin fails as a currency because it is not a stable store of value and is not used for daily commerce.
  • Illicit Use: A key criticism presented is that the primary function of crypto is to facilitate the movement of money by "crooks" without leaving a traceable audit trail.
  • Comparison to Gold: While acknowledging that gold has also fluctuated, the speaker notes that gold has historically maintained value over long periods, unlike crypto, which they predict will "dwindle away" over time.
  • Faith-Based Valuation: The speaker dismisses the "Proof of Work" argument, labeling it "Proof of Unnecessary Work" and comparing the valuation of Bitcoin to a "chain letter" or an idea based solely on the hope that someone else will pay more for it later.

2. Market Analysis and Investment Philosophy

The dialogue shifts to a broader debate regarding market forecasting and the speaker’s long-term bearish stance on equities.

  • Overvaluation: The speaker asserts that the market has been consistently overpriced by long-term historical standards.
  • The "Broken Clock" Argument: The interviewer challenges the speaker’s track record, suggesting that by being bearish for the majority of the bull market (since 2009), the speaker has provided poor guidance to investors.
  • Defense of Methodology: The speaker defends their position by distinguishing between internet-based commentary and their formal "quarterly letters," which they claim provide the true record of their investment thesis and warnings regarding market "melt-ups."

3. Performance of the Family Foundation

The speaker provides a case study of their own family foundation to illustrate the risks of thematic investing.

  • Strategy: The foundation focused on "Green Tech" to align investments with their mission of encouraging sustainable innovation.
  • Performance Volatility: The speaker admits the foundation went from being a top-tier performer (beating Harvard and Yale endowments on a 10-year basis) to a bottom-tier performer.
  • External Factors: The decline was attributed to two factors:
    1. Market Cycles: Entering a "bust" phase in the green technology sector.
    2. Political Risk: The impact of an administration perceived as "implacably anti-green," which negatively affected the sector's growth and the foundation's returns.

4. Notable Quotes

  • "I think it's a useless speculative... it will dwindle away. I suspect not with a bang, but a whimper." — The speaker on the future of Bitcoin.
  • "What does it do? What it does is allows crooks to move money around without leaving a trace. Brilliant." — The speaker on the utility of cryptocurrency.
  • "It pays no dividend. It doesn't represent an asset you can put your fingers on. There is nothing there, there." — The speaker on the lack of intrinsic value in crypto.

Synthesis and Conclusion

The discussion highlights a fundamental divide between traditional value-based investing and the speculative nature of digital assets. The speaker remains committed to the belief that assets must have tangible utility or cash-flow potential to be considered legitimate. While the interviewer challenges the speaker's long-term bearish market predictions, the speaker maintains that their focus on long-term valuation metrics remains valid, even if it contradicts the recent performance of the S&P 500. The segment concludes by emphasizing that thematic investing—specifically in sectors like Green Tech—is highly susceptible to both market cycles and political shifts, which can lead to significant performance swings.

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