Linear demand is a functional representation of the relationship between price and quantity demanded in which the demand curve forms a straight line due to a uniform distribution of reservation prices among consumers. It is characterized by a constant rate of change in quantity demanded for each unit change in price. A linear demand function is fully determined by two intercepts: (i) the quantity-axis intercept, known as Maximum Willing to Buy (MWB), and (ii) the price-axis intercept, known as Maximum Reservation Price (MRP). These two parameters uniquely define the demand schedule and allow it to be expressed in standard linear form.
Linear demand arises when consumers’ reservation prices—the maximum price each individual is willing to pay—are evenly distributed across the market. Because these reservation prices are uniformly spaced, each incremental increase in price removes the same number of buyers from the market. This creates a constant slope, producing a straight-line demand curve.
The quantity-axis intercept (MWB) represents total market size in physical units. It is the maximum quantity that can be sold when price equals zero. At this point, every potential consumer participates in the market, assuming each buys exactly one unit. MWB therefore functions as the full “demand capacity” of the market.
The price-axis intercept (MRP) represents the highest reservation price in the market, slightly above the maximum willingness of any consumer to pay. When price reaches or exceeds MRP, quantity demanded becomes zero because no consumer finds the product worth purchasing. Thus, MRP defines the absolute upper boundary of viable pricing.
Together, MWB and MRP define a complete linear demand system. The demand function can be expressed as:
Q = MWB * ( 1 - P/MRP)
This equation shows that quantity demanded declines linearly as price increases. The slope is constant and negative, reflecting the inverse relationship between price and quantity.
From a managerial perspective, linear demand is highly useful because it simplifies forecasting, pricing strategy, and revenue optimization. Firms can quickly estimate how changes in price affect demand, identify optimal pricing points, and evaluate market capacity using only two interpretable parameters: MWB and MRP.

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