Michael Porter does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond ...

A central part of quality management involves tracking, identifying and managing changes that occur in a system or process; these are variations. When changes are planned and executed well, the ...

A key risk-management tool in the complex world of derivatives margin trading is variation margin. Variation margin is used to fully collateralize derivative contracts and ensure the stability of the ...