Suppose there is a market consisting of identical firms producing the same quality of salt.

Suppose the market demand curve and the market supply curve for salt are given by:

$Q_D = \begin{cases} 350 - p & \text{for } 0 \leq p \leq 350 \\ 0 & \text{for } p > 350 \end{cases}$

$Q_S = \begin{cases} 220 + p & \text{for } p \geq 10 \\ 0 & \text{for } 0 \leq p < 10 \end{cases}$

Where $Q_D$ and $Q_S$ denote the demand for and supply of salt (in kg) respectively and $p$ denotes the price of salt per kg in rupees.