in the U.S. Navy for three years. Markham served in the Atlantic theater on the , which was the heavy cruiser acting as the flagship for the Normandy invasion, where he saw combat from the first attack on D-Day.

After the War, Markham began studies at Harvard University, and earned a master's degree in 1947 and a Ph.D. in 1949 in economics.

Career

In 1948, Markham began

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