The assessment is based on a convergence of high-authority and high-relevance sources that directly address the metric in question. Several sources (GuruFocus, MacroMicro) are identified as data providers that specifically track the 'total market capitalization of U.S. stocks' or the value of the Wilshire 5000 index, which is the standard proxy for this measurement. Another highly authoritative source, the US Chartbook, validates the metric's legitimacy by referencing the Federal Reserve as the primary data source for the 'market value of corporate equities.' There is a complete absence of contradictory evidence within the provided materials; the lower-quality sources are irrelevant to the specific claim. While the summaries do not explicitly confirm the '$72 trillion' figure, the fact that multiple credible sources exist for the sole purpose of tracking this specific data point makes it highly probable that the statement is a factual representation of that data. The high number of relevant, authoritative sources and the lack of any conflicting information support a high confidence level in the statement's truthfulness.