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A Coming Stock Market Crash?
DeepSeek  2025

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Hi DeepSeek,

How high is the likelihood of a stockmarket crash in the USA? The soaring gold price, Buffett Indicator, Price/Earning ratio, Price/Sales ratio and mean price reversion have all flashed red before past crashes, but rarely all at the same time.

Today, they’re all flashing red. Valuations have drifted far beyond what the companies' earnings, corporations' revenues or the US economy can realistically support. Will a crash in the USA spread to New Zealand?


Summary

  • USA: The likelihood of a significant market downturn is high based on valuation metrics. The environment is one of elevated risk. It's not a question of if a stock price reversion will happen, but when and how violently.

  • New Zealand: New Zealand would not be immune. It is highly susceptible to any US-led global downturn through financial, economic, and psychological channels. A US crash would almost certainly lead to a sharp fall in the NZ market and pose significant risks to the broader New Zealand economy.

This reminds us of the importance of having a well-diversified portfolio and a risk tolerance that can withstand significant market volatility.


Part 1: The Likelihood of a Stock Market Crash in the USA

The Case for High Risk (The "Red Flags")

  1. The Buffett Indicator (Total Market Cap to GDP): This is well into "significantly overvalued" territory, historically a strong predictor of low long-term returns.

  2. Elevated P/E Ratios: Whether looking at the Shiller CAPE (Cyclically Adjusted P/E) or trailing P/E for the S&P 500, valuations are high compared to historical averages, suggesting future earnings growth is already priced in.

  3. >Mean Reversion: This is the powerful force you mentioned. Markets have a long-term tendency to revert to their historical mean valuations. After a long bull market, the reversion can be sharp and painful.

  4. Concentration Risk: The market's performance has been heavily reliant on a small group of giant technology stocks (the "Magnificent Seven" etc.). If their momentum stalls, it can drag down the entire index.

  5. "Higher for Longer" Interest Rates:The Federal Reserve's battle against inflation has led to interest rates not seen in decades. This makes borrowing more expensive for companies, reduces the present value of future earnings (making stocks less attractive relative to bonds), and cools down the economy.

The Counter-Argument (Why a "Crash" Isn't a Certainty)
  1. Artificial Intelligence (AI) Optimism:Proponents argue that we are in a new technological paradigm. The potential productivity gains from AI could justify higher valuations if they lead to a significant surge in earnings growth in the future. The market is betting on this future.
  2. Corporate Profit Resilience: Despite headwinds, corporate earnings have remained relatively strong overall. A strong labor market has so far helped the economy avoid a recession.

  3. The "TINA" Argument ("There Is No Alternative"): While bonds now offer decent yields, the equity market has been the primary engine for wealth creation for over a decade. This can create a behavioral bias to stay invested.

  4. The Fed's "Put": Many investors believe the Federal Reserve would intervene to support markets if a downturn threatened to cause a systemic financial crisis, limiting the downside.


Conclusion on US Likelihood:

It is more accurate to say the probability of a major correction or a bear market is high, rather than predicting a specific "crash" (e.g., a 20%+ drop in a short period). The conditions are ripe for a significant downturn. The key triggers would likely be:
    • A recession finally materializing.
    • Earnings disappointing relative to high expectations.
    • A geopolitical shock.
    • A crisis of confidence in the tech giants.

The metrics you listed suggest that the risk/reward profile for US stocks is very poor from a long-term perspective. While a crash is not guaranteed, the market is priced for perfection, and any stumble could lead to a sharp decline.


Part 2: Will a Crash in the USA Spread to New Zealand?

The short answer is: almost certainly yes.

New Zealand's financial markets are highly integrated with global markets, and the US market is the world's largest and most influential. Here’s how a US crash would transmit to New Zealand:

  1. Psychological Contagion (Risk-Off Mode): A US crash creates global fear and a "risk-off" sentiment. Investors worldwide sell risky assets (like stocks) and move to safe havens (like government bonds, gold, or the US dollar). This selling pressure would hit the NZX (New Zealand's stock exchange) directly.

  2. Economic Linkages:
    * China Connection: New Zealand's economy is heavily dependent on exports, particularly to China (dairy, meat, timber). A US recession would likely slow the global economy, reducing demand from China for New Zealand's commodities. This would hurt NZ's corporate earnings and economy.

    * Tourism: A US/world recession would reduce international travel, impacting New Zealand's vital tourism industry.

  3. Financial System Linkages: New Zealand banks source a significant portion of their funding from international markets. A global financial shock could make this funding more expensive and scarce, tightening credit conditions within New Zealand.

  4. Currency Volatility: In a panic, investors often buy US dollars. This could cause the NZD to fall sharply against the USD. While this helps exporters, it increases the cost of imports (fuel, electronics) and can fuel inflation.

Potential Mitigating Factors for New Zealand:

  • NZ Market Didn't Run as Far: The NZX 50 has not experienced the same meteoric rise as the US market, particularly in tech. Its valuations, while not cheap, may not be as stretched, potentially offering some relative resilience.
  • Commodity Prices: If a US downturn is driven by Fed policy rather than a collapse in Chinese demand, commodity prices might hold up better, supporting NZ's export sector.