These essays are used to ensure that youre not a complete muppet who can talk the talk but not walk the walk. These things are all about the arguments which you put forward, there is no right or wrong, just as long as you can back up your statements, then you'll be fine. Its analytical thinking that they're looking for. They will most likely ask you about the essay in the interview. But the questions will be "So why do you think X?", "What would you do if you were the marketing director of Ford?", with direct relation to the content of your essay. Maybe consider linking the content to some tool or methodology that you've learned during your studies. Consultants love this stuff!Anyway, good luck and please post back with any specific q's about PA.