Market Euphoria US equity market valuations have experienced remarkable market cap appreciation and resilience to downdrafts. The headline news attributes it to technological innovation, low interest rates, and fiscal stimulus. Is it real, or are we experiencing a tech bubble that has, by some metrics, surpassed what we saw in the dot com bubble of the late 90’s? Key valuation metrics suggest that US stocks, particularly in technology-heavy indices, are trading at extended levels. Will Artificial Intelligence (AI) deliver, or are we repeating our past mistakes of over-estimating the immediate benefits of a ground-breaking technology and getting ahead of ourselves? Concentration in the S&P 500: Dominance of NVDA and MSFT The S&P 500 is market-cap weighted, meaning larger companies exert outsized influence in the S&P 500’s returns. As of August 14, 2025, the S&P 500’s total market capitalization is approximately $54.45 trillion. About a year ago, I showed that […]