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Demand, Supply and Market (Demand (Variation (Shift the curve (change D ),…

- - - - Price
        
        price ↑, demand ↓
    - - Expectation
        
        For the future; if you know the price of pizza will raise next week, you will purchase more (increase demand) this week
      - Number/ composition of consumer
        
        Population grow, the demand of pizza increase; if the total population is same, the composition of young increase, the demand of pizza also increase
      - Price of other goods
        
        Substitution (replacement)
        
        The price of substitution ↓, the demand of goods ↓
        
        Complements (pair)
        
        The price of complements ↑, the demand of goods ↓
        
        If the change percentage is same, no substitution
      - Taste (subjective)
      - Income
        
        Real income
        
        Measured as item; Changes when the price level is changed
        
        ↓ of the price of the goods, ↑ real income (number of items), ↑ the demand of normal goods
        
        The demand of inferior good (used good) will ↓, as the real income is ↑
        
        Money income
        
        Remain constant
- - - - The price of other goods
        
        The price drop of other goods make this goods more attractive
      - Producer expectation
        
        Future profitability
      - The price of resource
        
        ↑ price of resource,↓ the supply
      - Number of producers
        
        If the number of producers increase, the supply will also increase
      - Technology
        
        Better technology make the curve shift rightward
    - - Price
        
        The price of good ↑, the supply ↑