We keep talking about "Market Irrationality" as if humans were still making the decisions.
u/Molboules ·
Reddit — r/stocks
· April 19, 2026 at 10:48
· ⬆ 40 pts
· 💬 16 comments
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Is it just me, or is there a massive elephant in the room every time we discuss "market sentiment" or "irrational behavior" here? We spend hours analyzing P/E ratios, Fed speeches, and "retail fear," but we almost never address the fact that the vast majority of daily flows are no longer managed by humans. We are analyzing a 2026 market using a 1990s psychological framework.
When people say the market is "behaving irrationally," they usually mean it’s not reacting the way a logical human observer would. But why would it?
We aren't just trading against "other guys." We are trading against HFT (High-Frequency Trading) systems and LLM-based sentiment scrapers that can execute a million trades before you’ve even finished reading a headline. For an AI, "value" is just one weight in a multidimensional vector. If the momentum algo says "buy" because it detects a specific pattern in the order book, the P/E ratio becomes irrelevant noise.
The stock market, In reality, is increasingly becoming a theater of war between competing black boxes. When we see a "flash crash" or a random 3% spike on no news, it’s likely not "investor panic" but a cascade of stops being hit and algorithms reacting to each other in a closed loop.
The market isn't "crazy", it’s just increasingly artificial. We are trying to apply human psychology (fear, greed, hope) to lines of code that only understand optimization and latency.