The classical square-root formula for optimal lot size is a useful tool especially for those manufacturing processes in which labor intensive items are produced in small quantities. There is a class of stationary lot sizing problems to which this formula applies. With learning effects introduced...

In order to explain equity returns, the single index model (which corresponds to the CAPM) was extended in various ways to multi-factor models. Following Chen/ Roll/Ross, macroeconomic variables are the favorites for the additional factors. Fama/French (1993–1998) use the return of specially...

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