How you derive demand curve of a product using ordinal theory?

To derive the demand curve of a product using ordinal theory, we start by analyzing consumer preferences based on utility maximization without assigning specific numerical values to utility. We consider the consumer's budget constraint and their preference ordering for different combinations of goods, which helps us identify the optimal consumption bundle. By varying the price of the product and observing how the consumer's choice changes, we can trace out the demand curve, reflecting the relationship between the price of the product and the quantity demanded, based on the consumer's ordinal rankings of preferences. This approach emphasizes the rank order of preferences rather than the exact utility levels.