In an answer of at least two well-developed paragraphs, provide a definition of the law of demand and explain how it can be used to determine prices. provide an example of your own to illustrate this concept.

The law of demand states that quantity purchased varies inversely with price. In other words, the higher the price, the lower the quantity demanded. This phenomenon occurs because when consumers' opportunity cost increases, they must give something else up or switch to a substitute product.The law of demand is one of the most fundamental concepts in economics. It works with the law of supply to explain how market economies allocate resources and determine the prices of goods and services.

The Law of Demand in Practice

The "curve" above is simplified as a straight line, but in fact the shape of the curve varies by product. Demand curves are generally concave, reflecting the fact that consumers can become saturated with a given product: How many pairs of underwear can you wear between laundry days? How many cars can you park in your garage (or afford to insure and maintain)? 

It's important to distinguish between temporary and longer-term price changes—particularly in online shopping, with its fine-grained price changes. Consumers might buy more of an item on temporary discount to 1) stock up on nonperishables they will need before the items go on sale again (shirts, for example), 2) make a long-planned purchase at a lower price (a big screen television), 3) get the current model of a product before a new model is released (cars or smartphones), or 4) on impulse.

For longer-term prices, consumers will prefer more quantity at lower prices. The question is whether falling costs enable those lower prices that consumers prefer. This leads to the interaction of the law of demand with the law of supply and the supply curve. In the U.S., as of 2018, the average price of goods excluding food and fuel, had not reached 1995 levels due to technological innovation and global trade's downward pressure on costs.

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