Ludwig von Mises once wrote: "Economics, as a branch of the more general theory of human action, deals with all human action, i.e., with man's purposive aiming at the attainment of ends chosen, whatever these ends may be."
Essentially, market participants act in their self-interest. For this reason, I find it hard to believe that the Federal Reserve actually thought the assets it purchased and stored in Maiden Lane would remain investment-grade. After all, if the assets were so valuable, JPMorgan Chase and Co. (JPM) would have kept them for themselves. The fact that JPM was not interested in the assets should have sent a clear message to the Federal Reserve that the assets were not worthwhile.
Instead, as this Bloomberg article points out, the "Fed Made Taxpayers Unwitting Junk-Bonds." According to Bloomberg, "more than 88 percent of Maiden Lane’s CDO [collateralized debt obligation] bonds and 78 percent of its non-agency residential mortgage-backed debt are now speculative grade... as of Jan. 29."
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