The demand curve is central to understanding the intricacies of consumer behavior. Generally, it slopes downward and to the right due to the law of demand. This fundamental economic principle dictates that, all else being equal, as the price of an item decreases, the quantity demanded by consumers increases.
The explanation for this behavior involves two major effects:
- Substitution Effect: As a product becomes cheaper, consumers tend to switch from more expensive alternatives, increasing the quantity demanded of the cheaper product.
- Income Effect: A decrease in price effectively increases consumers' purchasing power, allowing them to buy more of the product.
While the law of demand is a guiding principle, certain exceptions exist, such as in the case of Giffen and Veblen goods.