IB Economics | Non Price Determinants Of Demand: Complements

In this video I explain what happens on the market of complement products when there is a change in price of one of them.
For instance consider that tea kettles and tea are complements. That is to say, they can only be consumed together.
If the price of tea kettles increases, then there is less quantity demanded of tea kettles. I.e. there is a movement along the curve. With less tea kettles consumed, there is also less tea demanded. As a result the demand curve for the tea shifts to the left.