What factors affecting the demand of automobiles?

Answer 1

Complementary goods are consumed with other goods and the prices for these goods can affect demand for automobiles. These factors can include petrol prices, tyre prices or vehicle registration costs. In general, if any of these increase, their demand will decrease, along with demand for automobiles.

Supplimentary goods are consumed instead of other goods, in other words, they are alternatives to a certain good. In this case, they could include bicycles, motorcycles, footpaths and public transport. If any of these goods increase in price, then automobiles will become more in demand due to being a cheaper alternative, whereas if the price of the goods decrease, demand for automobiles will likely decrease.