Despite a massive tech stock run-up, key sentiment indicators and surveys of major asset allocators show caution, not the extreme bullishness seen in bubbles like the dot-com era. This suggests the market may not be at its absolute peak yet.

While institutional capital market assumptions align with objective, yield-based models, their actual portfolio actions can deviate. Many institutions, despite models suggesting caution on expensive US stocks, maintained market weight, benefiting from the prolonged bull market. This highlights a critical inconsistency between their stated process and real-world behavior.

A true market bubble isn't defined by high valuations but by collective psychology. The most dangerous bubbles form when skepticism disappears and everyone believes prices will rise indefinitely. Constant debate about a bubble indicates the market hasn't reached that state of universal conviction.

Widespread public debate about whether a market is in a bubble is evidence that it is not. A true financial bubble requires capitulation, where nearly everyone believes the high valuations are justified and the skepticism disappears. As long as there are many vocal doubters, the market has not reached the euphoric peak that precedes a crash.

Despite the confidence with which they are presented, annual stock market predictions from major investment banks are notoriously unreliable. Data from 2003-2023 shows the median forecast was off by 14 percentage points, highlighting the futility of trying to precisely time the market based on expert commentary.

Like chipmunks who learn to ignore constantly panicking peers, the market tunes out commentators who always cry wolf. Credibility is built through restraint. Experts like Warren Buffett, who make sparse market calls, carry immense weight because their "alarm calls" are rare and reliable.

Current market bullishness is at levels seen only a few times in the past decade. Two of those instances led to corrections within three months. This euphoria, combined with low volatility and high leverage, makes the market vulnerable to even minor negative news.

While being a market Cassandra can build a reputation, being too early is costly. Charles Merrill of Merrill Lynch famously warned of a crash in 1928, but investors who heeded his advice missed a 90% market run-up before the October 1929 peak, illustrating the immense financial downside of exiting a bubble prematurely.

A clear statement from a financial leader like the Fed Chair can instantly create common knowledge, leading to market movements based on speculation about others' reactions. Alan Greenspan's infamous "mumbling" was a strategic choice to avoid this, preventing a cycle of self-fulfilling expectations.