Bloomberg reported that the extra yield U.S. corporate bonds offer instead of Treasuries approached a six-year low as investors speculated the economy will pick up after the North American winter ends.

Bloomberg said, based on Bank of America Merrill Lynch indexes, bonds in an index of investment-grade company debt yielded 1.24 percentage points more than government securities on average. The spread was 1.22 percentage points in January, the smallest difference since July 2007.

Bloomberg notes that Treasuries have returned 1.6% this year through February 21, versus 2.3% for U.S. investment-grade company debt. indexes.

To read the entire Bloomberg article, click here.