Marketing Environment is affected by non marketing factors
Marketing interests you, you love yourself, you are allergic to pretentious esoteric voluntarily maintained by most of its practitioners. Responsible for a business, small or medium, or any department thereof, or free or independent professional, you want to be able to use the approaches effectively, but without breaking the bank.
The world changes, we enter the era of marketing "flexible." After millennia of widespread shortages, the Industrial Revolution brought the Western world overcapacity of industrial goods. The potential supply exceeds demand then existing, the competition is also fierce, you "invented" ...