Question
With the help of a diagram explain the effect of “decrease” in demand of a commodity on its equilibrium price and quantity.

Answer

Decrease in demand means less demand at the same price. This leads to shift of demand curve to the left from $D_1$ to $D_2$.
  • Given equilibrium at $E1$ shift of demand curve leads to excess supply $= AE_1$ at price $OP_1$.
  • This creates a situation where producers are not able to sell all they want to sell at price $OP_1$. They start offering lower price. As a result price starts falling.
  • As price falls, supply begins to fall along the supply curve S and demand begins to rise along the demand curve $D_2$​​​​​​​.
This continues till the new equilibrium at $E_2​​​​​​​$.
  • At new equilibrium, price falls to $OP_2$ and quantity falls to $OQ_1​​​​​​​$​​​​​​​.

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