How do companies incentive consumers to buy their facial products?

SOURCE: The Strategist

• The economic principle (Links to an external site.)Links to an external site. I will explore is (copy/paste bolded from the link): People generally respond to incentives in predictable ways.
• The overall question I will research to help explore the economic principle is (the question should contain 1-2 keywords from the economic principle): 
•  How do companies incentive consumers to buy there products?
• 3-4 subquestions that will help me answer my overall research question are: 
  • why do people choose one product over the other?
  •   What helps to persuade people to choose their product?
  •   What is the best way to promote a products
• Links to 3-4 reliable resources that can help answer the research question:
  • Shopify 
  •  Launchgrowjoy
  • Mackenziecorp