reference for number 1&2: https://www.thebalance.com/shift-in-demand-curve-when-price-doesn-t-matter-3305720https://www.khanacademy.org/economics-finance-domain/microeconomics/supply-demand-equilibrium/supply-curve-tutorial/a/what-factors-change-supply

1. How tastes or preferences affects the demand curve? 2. How weather conditions affects the demand curve? 3. What are the advantages of a perfect competion in a market? 4. What is the significance of the market structure and how does it affect the consumer