The total expenditure method is a practical approach to measure the price elasticity of demand, which examines how the quantity demanded of a good responds to changes in its price. This method is based on observing the changes in total expenditure, or total revenue, as the price of a good changes. Total expenditure (TE) is calculated by multiplying the price of a product (P) by the quantity demanded (Q), that is, TE = P × Q. The principle behind this method is that the relationship between price changes and total expenditure indicates whether demand is elastic, inelastic, or unitary elastic. When the demand for a product is elastic, a small change in price results in a relatively larger change in quantity demanded. In such cases, a decrease in price leads to an increase in total expenditure because the proportionate increase in quantity demanded exceeds the proportionate decrease in price. Conversely, an increase in price reduces total expenditure as the reduction in quantity demanded outweighs the gain from higher price. This behavior reflects that consumers are highly responsive to price changes when demand is elastic. In contrast, when demand is inelastic, a change in price causes a