Final answer:
Social Darwinism is not one of the competitive strategies.
Step-by-step explanation:
The answer to the question 'Which is NOT one of the competitive strategies?' is social Darwinism. Social Darwinism is a theory that applies the principles of natural selection to society and does not pertain to competitive strategies in business. The other options listed; horizontal integration, vertical integration, and the holding company model, are all competitive strategies commonly used in business.