请分别生成flat&vertical demand curve的CS画法， steeper vs flatter demand curve的change in CS when price increases or decreases的画法

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Consumer surplus is a fundamental concept in economics that measures the benefit consumers receive from purchasing goods. It represents the difference between what consumers are willing to pay, shown by the demand curve, and what they actually pay, which is the market price. The triangular area above the market price and below the demand curve represents the total consumer surplus in the market. When demand is perfectly elastic, the demand curve becomes a horizontal line. This means consumers are willing to buy any quantity at exactly one price, but nothing at any higher price. Since consumers pay exactly what they are willing to pay, there is no difference between willingness to pay and actual payment. Therefore, consumer surplus is zero in this scenario. This situation occurs when there are perfect substitutes available in the market.