The Market Demand Curve is a graph charting the relationship between the price of a commodity and the demand for that commodity. It shows how many units of the product consumers are willing to purchase at different price points. In other words, it illustrates how far consumers are willing to stretch their budgets in order to buy different products. This curve is an essential tool for businesses, as it helps them understand how changing prices can affect product sales. By studying the market demand curve, companies can make informed decisions about pricing strategies and gauge the effectiveness of promotional campaigns.