CHART 35 Changing Relations Among Interest Yields, 1928–39 Per cent 9 Corporate bonds, Baa Corporate bonds, Aaa Basic yi

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Chart 35 Changing Relations Among Interest Yields 1928 39 Per Cent 9 Corporate Bonds Baa Corporate Bonds Aaa Basic Yi 1 (44.53 KiB) Viewed 31 times

Chart 35 Changing Relations Among Interest Yields 1928 39 Per Cent 9 Corporate Bonds Baa Corporate Bonds Aaa Basic Yi 2 (44.53 KiB) Viewed 31 times

and whats happening during that time period that causes what happens in the chart.
please answer
CHART 35 Changing Relations Among Interest Yields, 1928–39 Per cent 9 Corporate bonds, Baa Corporate bonds, Aaa Basic yield of 40-to-50-year corporate bonds Commercial loans, 19 cities U.S. bonds not due or callabte for 12 years or more 2 Commercial paper, 4-to-6 month Bankers'acceptances, 90 day to... Short-term U.S. securities 38 39 1928 29 30 31 *32 33 34 *35 36 37