Series Is Presented Here As Three Variables--(1)--Original Data, 1870-1813 (2)--Original Data, 1924-1931 (3)--Original Data, 1926-1935. Data Refer To Simple Average Yield Of Gold Mortgage Bonds With Nominal Interest Rates Of 5, 6, 7, 8, And 10%. Each Group Is An Average Of Ten Bonds (Except In 1926, When The 6% Group Is An Average Of Four Bonds, And In 1927, When The 10% Group Is An Average Of Eight Bonds). Sometimes Figures Are Published Without Indicating The Number Of Bonds. Source: Wirtschaft Und Statistik, 1925, P. 207, And Following Issues. This NBER data series m13028b appears on the NBER website in Chapter 13 at http://www.nber.org/databases/macrohistory/contents/chapter13.html. NBER Indicator: m13028b