An almost complete recovery in credit markets since the selloff late last year and a dovish Federal Reserve are refocusing attention on the multiyear boom in corporate debt, along with the risks that might now be stored up for a later date. For strategists at Deutsche Securities Inc., “unstoppable risk-taking” in the form of debt-financed share buybacks and acquisitions is stirring uneasy memories of the previous financial crisis, when Wall Street churned out a different type of security to satisfy rampant investor demand.

They argue that sluggish global growth, aging populations, and low interest rates create a massive and long-running headache for big investors such as pension and sovereign wealth funds: huge liabilities that “require high asset returns to avert bankruptcy.”

In the years before the crisis, those returns were served by a smorgasbord of securitized products created by investment banks that repackaged subprime loans into top-rated bonds. Investors often applied leverage, using derivatives or short-term funding, to juice returns.

“To make 'processed food' capable of satisfying investors' voracious appetite for high returns, it is necessary to have high-calorie (high-yield) ingredients,” Deutsche analysts Masao Muraki, Hiroshi Torii, and Tao Xu write in their note. “Accordingly, the finance and non-bank industries (investment banks at the top) cooked up a scheme to create high-yield loans by getting low-income workers to buy houses.”

Fast forward to today, and a similar process is under way in the corporate debt market, with highly leveraged companies becoming the ingredient du jour and asset managers replacing investment banks as the servers dishing out products to a new group of investors. The buyers now range from retail investors to exchange-traded funds (ETFs) to Japanese banks snapping up highly rated bundles of leveraged loans.

“After the global financial crisis, investment trusts (including ETFs) stepped up their investments in low-grade corporate credit (mainly companies in the U.S. and developing countries),” they argue. “Investment trusts have become enormous shadow banks for U.S. companies, providing 20 percent of their financing needs (corporate bonds and loans), compared with just 9 percent in 2007.”

Copyright 2019 Bloomberg. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.