The Consulting and Audit Landscape: What Organizations Pay For, and What They Get

Organizations worldwide spend more than $700 billion a year on consulting and audit: the two primary external mechanisms they use to evaluate their own health and improve performance. Estimates place the global consulting market between $320 and $470 billion, and the audit market between $225 and $277 billion (Fortune Business Insights; Zion Market Research; Verified Market Research, 2024).

The evidence on what that spending produces is troubling. This report surveys the public record, and one pattern runs through all of it: consulting tests what an organization should do, audit tests what it reported, and neither tests whether the system underneath can hold.

What the controlled research shows

The strongest evidence on consulting effectiveness is also the most recent. A 2026 study in JAMA examined 2,343 nonprofit hospitals over fourteen years. More than a fifth hired management consultants, spending an average of $15.7 million each, $7.8 billion in total. The finding: “no evidence of meaningful changes in hospital finances, operations, or quality of care.” Across operating margin, cash reserves, readmissions, and mortality, the estimated effects were close to zero.

It is the largest controlled study of its kind, it is peer-reviewed, and its conclusion is direct: the spending produced no detectable improvement.

The industry’s own most-cited number, the claim that 70% of consulting projects fail, turns out to have no empirical foundation at all. Two peer-reviewed analyses (Candido and Santos, 2015; Hughes, 2011) traced the statistic to its sources and found “no reliable evidence to support the assumption.” The figure is repeated because it is repeated. The true rate remains unknown.

What auditing catches, and what it misses

An audit verifies that what was reported matches what was required. Within that boundary it is valuable. The evidence shows where the boundary lies.

Over fifteen years of PCAOB inspections, roughly one in three audits failed to obtain sufficient evidence to support the opinion issued (about 37% on average, 39% in 2024). And the single audit function most tied to survival, the going-concern warning, is largely absent when it matters most. The University of Sheffield Audit Reform Lab analyzed the 250 largest UK companies that collapsed between 2010 and 2022 and found auditors failed to warn in three out of four cases. Seventy-five percent of failed companies received audit reports that said, in effect, they would continue to exist.

What that looks like in practice:

• Silicon Valley Bank (2023): clean audit, collapsed 14 days later.
• Wirecard (2020): clean audits for 11 consecutive years; €1.9 billion in cash did not exist.
• Carillion (2018): unqualified opinions for 19 years; failed with £7 billion in debt.
• Lehman Brothers (2008): $50 billion moved off balance sheet with auditor sign-off.

In each case the audit confirmed that the reported numbers met the standard. In each case the failure came from a condition the audit was never designed to test: liquidity under stress, fabricated assets, an unsustainable contract structure, misaligned incentives.

The gap everyone senses but no one tests

Research on the “audit expectation gap” measures the disconnect directly: 72% of investors believe auditors are “public watchdogs,” while only 33% of auditors agree (Columbia Law School, 2022). Investors think audits test organizational health. Auditors know audits test financial reporting. The space between those two beliefs is where structural failure lives undetected.

None of this is a case against consulting or audit. Both do real and necessary work, and both do exactly what they are designed to do. The point is narrower, and structural: an organization can receive sound advice, pass every audit, and still be fragile. The advice may be unsustainable by the system it enters. The audit may be clean but blind to the conditions that will produce the next failure. Both services operate on the surface. Neither reaches the architecture beneath it.

What this leaves open

The evidence establishes that the gap exists, that it is measurable, and that its cost is substantial. It does not, on its own, close the gap. The open question is whether a diagnostic discipline can be built that tests what consulting and audit do not: the structural integrity of the system itself.

That is the question QSIA™ was built to answer. See how it works →

The full report below documents every figure above with its primary source, sector by sector and case by case.