Bodie, Zvi, Robert C. Merton, and William Samuelson. "Labor Supply Flexibility and Portfolio Choice in a Life-Cycle Model." Journal of Economic Dynamics & Control 16, nos. 3-4 (July–October 1992): 427 ...
There is, furthermore, a persistent feeling that the life cycle concept adds luster and believability to the insistent claim in certain circles that marketing is close to being some sort of science.