How do mega trends affect the Purchasing and Supply Management professional in the exercise of his/her duties and responsibilities

How do mega trends affect the Purchasing and Supply Management professional in the exercise of his/her duties and responsibilities – in particular, Supply Chain Management and Supplier Outsourcing in the public and private sectors? What are the salient factors that have contributed to the evolution of the Purchasing and Supply Management profession? Are the use of supply chain management principles/practices and the establishment of strategic alliance agreements with select suppliers more conducive to private sector organizations?