Rise of Credit Rating Agency Power in Capital Markets

The credit rating agency power expansion is the story of how Moody’s, Standard & Poor’s, and Fitch evolved from private information vendors into quasi-regulators whose ratings determine which bonds are marketable and which are not. Starting in the 1970s and crystallizing through the 1990s and 2000s, regulatory bodies worldwide wired ratings into law—pension funds were required to hold only investment-grade debt, banks had to meet capital adequacy rules tied to issuer ratings, and securities rules made ratings judgment legally binding. The agencies did not lobby for this; regulators granted it. The outcome was a structural conflict of interest—the agencies’ profits depend on issuers paying them to rate securities—that went unaddressed until the 2008 crisis exposed it.

Before: ratings as a service, not a regime

In the early 20th century, rating agencies—starting with Poor’s (founded 1860) and Moody’s (1909)—were boutique research firms. They published independent assessments of bond credit quality. Investors subscribed to their reports or bought individual ratings. The agencies made money the way any research business does: by selling information to subscribers. The key point: they held no regulatory mandate. A bond could be unrated, or rated by one agency differently from another, and still trade freely. Issuers were not required to hire a rater. Investors made their own due diligence. The market was fragmented but honest.

That changed as capital markets grew. Large institutions—mutual funds, insurance companies, pension funds—needed a shorthand for credit risk across thousands of bonds. Standardized ratings seemed efficient. During the 1970s, as the bond market exploded and regulatory bodies sought to tighten oversight of institutional investors, the idea took hold: enshrine ratings in law.

The regulatory turn: NRSRO and mandatory reliance

In 1975, the SEC created the concept of the “Nationally Recognized Statistical Rating Organization” (NRSRO). The agency did not name specific firms; it set criteria. But Moody’s and S&P already dominated the market through reputation. To become an NRSRO, a firm had to demonstrate a track record, methodology, and scale. The barrier to entry was high. By the 1980s, the Big Two (later the Big Three after Fitch) held NRSRO status. More importantly, regulators mandated reliance on NRSRO ratings in an expanding web of rules.

Federal Reserve regulations began tying bank capital adequacy to ratings: a bank holding AAA-rated bonds could count them as zero-risk in leverage ratio calculations, but holdings of below-investment-grade (sub-BBB) bonds faced penalty charges. Insurance regulators imposed similar rules on reserves. Securities law made ratings official inputs to bond-fund eligibility. A bond that dropped from BBB to BB—a single-step downgrade—suddenly became ineligible for many index funds, forcing automatic selling and price collapse. Pension funds, governed by fiduciary rules, could only hold investment-grade debt (BBB and above). The effect: a rating became not just an opinion but a legal trigger.

The issuer-pay conflict: fees from the very firms being rated

As ratings became regulatory mandates, demand for them soared. But here is where the flaw took root: issuers—not investors—were paying the agencies for the ratings. A company issuing bonds would hire Moody’s to rate them, Moody’s would conduct analysis and publish a rating, and the issuer would pay the rating fee. Investors received the rating as a byproduct.

This “issuer-pays” model created a direct conflict of interest. If Moody’s rated a bond aggressively (giving it a high rating), the issuer was happy and likely to hire the firm again for future bond issues. If Moody’s gave a low rating, the firm would be unprofitable for the issuer and might not be rehired. The incentive was clear, if unspoken: be generous with your ratings, or your clients will shop for a friendlier competitor. This dynamic is known as “rating shopping.” A company might approach three agencies and cherry-pick whichever one gives the highest rating (or the most favorable analysis) to include in its prospectus.

In theory, reputation should have constrained this. If an agency handed out inflated ratings and they defaulted, the agency’s credibility would tank and investors would discount its ratings. But between the 1980s and 2008, defaults on AAA-rated securities were rare. The track record looked good, even though the model was broken.

The subprime mortgage boom and the ratings collapse

By the early 2000s, the credit rating system had become the central nervous system of global finance. Mortgage-backed securities (MBS), structured products, and complex derivatives all relied on ratings to sell to institutional investors. A pension fund could not touch a non-rated or sub-investment-grade tranche. Banks in Europe, Japan, and Asia bought billions of AAA-rated mortgage bonds without reading the prospectus, trusting the rating as a proxy for safety.

Moody’s and S&P, facing massive demand from issuers of subprime mortgage securities, liberalized their rating methodologies. Mortgages were historically prime (strong borrowers, 20% down payments); subprime was a niche. But as subprime volumes surged in 2003–2006, agencies faced pressure: issue high ratings or lose market share to a competitor. They revised models to assume that house prices would never fall nationwide (they had not since the Great Depression), that subprime loans could be bundled and “tranched” to isolate risk, and that defaults would remain isolated. All three assumptions proved catastrophically wrong.

Moody’s and S&P gave thousands of mortgage bonds a AAA rating. These securities defaulted en masse in 2007–2008. Investors who bought them on the faith of the ratings lost hundreds of billions. The agencies’ analytical failure was compounded by their structural conflict: they had been paid by the issuers to rate these very securities.

Aftermath and the limits of post-2008 reform

The 2008 crisis shattered the myth of agency infallibility. Regulators moved to reduce mandatory regulatory reliance on ratings. The Dodd-Frank Act (2010) instructed regulators to strip out references to ratings in capital rules and replace them with bank-developed risk metrics. But change was slow and incomplete. Many rules still reference ratings as a bright-line trigger. ETF managers still filter holdings by rating. Pension fund charters still mandate investment-grade-only portfolios. The regulatory scaffolding, once built, proved durable.

The agencies themselves consolidated further. Fitch and S&P merged ownership (both under McGraw Hill then S&P Global), creating an even tighter duopoly (later oligopoly, as Moody’s remained independent). New entrants tried to break in—some smaller agencies sought NRSRO status—but never reached scale. The switching costs for investors and issuers kept the Big Three dominant.

Why the structure persists

The credit rating system persists not because it works perfectly, but because the alternatives require more work. Investors and regulators prefer a single, standardized metric—a rating—to doing individual credit analysis on thousands of bonds. The rating becomes what economists call a “credence good”: something whose quality is hard to judge even after purchase, so users rely on a certified intermediary. Once embedded in law, such systems are hard to dislodge. Changing capital adequacy rules requires international coordination (Basel Committee), pension fund rules vary by jurisdiction, and fund managers still use ratings as a quick filter.

The issuer-pay conflict also persists because the investor-pays alternative (investors paying for ratings) is administratively messy. Who decides which bonds get rated? Which investors pay for which ratings? The issuer-pay model is simpler, even if flawed. Regulatory oversight has tightened slightly—the SEC now polices rating methodologies more closely, and agencies must disclose conflicts—but the fundamental structure remains.

The result is a system where three private firms hold immense power over which companies can access bond markets and at what cost. Their decisions are not fully transparent; their incentives are structurally misaligned with investors’ interests; and their track record includes at least one epic failure. Yet removing them would require a coordinated regulatory overhaul that shows no sign of materializing.

See also