Editing Marshallian demand function (section)

== Demand curve ==
Marshall's theory exploits that demand curve represents individual's diminishing marginal values of the good. The theory insists that the consumer's purchasing decision is dependent on the gainable utility of a goods or services compared to the price since the additional utility that the consumer gain must be at least as great as the price. The following suggestion proposes that the price demanded is equal to the maximum price that the consumer would pay for an extra unit of good or service. Hence, the utility is held constant along the demand curve. When the [[marginal utility]] of income is constant, or its value is the same across individuals within a market demand curve, generating net benefits of purchased units, or consumer surplus is possible through adding up of demand prices.

[[File:Marginal utility and demand.png|thumb|The intersection point of 'Price' and 'Marginal utility = Demand' shows the optimal level of individual's consumption.]]