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Help with references for the following ASK THE PROFESSOR inquiry would be 
appreciated. -- RBE 
 
When and with whom did the idea that earned incomes follow concave paths 
originate? Also, when and who first described the traditional human capital 
accumulation pattern, i.e. that schooling occurrs at a relatively young age 
followed by on the job training? Regarding the latter question, B.F. Kiker 
in \"Human Capital: In Retrospect\" 1968 reveals that Ernst Engals 
described this pattern in the 1880s.  
 
Any specific references would be appreciated.  
 
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