To put that into perspective, I went back to 1980 (N = 1444 trading weeks) and found that this was the widest gap during that time. Indeed, the second widest gap was 1.43%, registered during the market panic in October, 1987. The median gap since 1980 has been 1.09%, as commercial paper has traditionally yielded a bit more than Treasury bills to compensate for an additional dollop of risk.
When commercial paper yields much more than Treasuries, however, the market is pricing in far more than a dollop of corporate risk. Since 1980, we have had only nine weekly periods in which commercial paper yields have exceeded those of T-bills by 30% or more. Here are the dates in descending order of yield spread:
You can see that these dates really only represent four periods in recent market history: Fall, 1982; late 1987; October, 1998; and the present period. The first three were excellent long-term buying opportunities. Fading fears of corporate liquidity turned out to be an excellent strategy. Let's see if the recent panic is similarly kind to the bulls.
Finding Gain Where There's Been Pain