Marketing Mix the Four P's?

Over the four marketing eras, how did the emphasis on the four Ps change?

• Answer:

  It would seem to me that you could just as easily look up the correct answer for yourself, as post the question on this forum, thus not having to depend upon the accuracy and honesty of the unknown stranger that answers. Furthermore, the answers to which you are able to find information on your own will have a much more profound impact on your education. This forum was designed as an exchange of ideas, not a place to short-circuit homework. The answers you seek are likely found in a textbook or required reading material and not from amateurs such as are found here. Please refrain from posting any more homework questions here. Good luck. I wish you well in your education.