What Does The “Law Of Demand” State?

David McDonald

David McDonald

David is a 19-year-old Canadian student currently attending the University of Guelph. He currently studies Public Management and economics with hopes of one day becoming an accomplished journalist. David enjoys reporting on global events and actively try to make a difference in the world.
David McDonald

The law of demand is a microeconomic law that states, all other factors being equal, as the price of a good or service increases, consumer demand for the good or service will decrease, and vice versa. The Law Of Demand says that the higher the price, the lower the quantity demanded because consumers’ opportunity cost to acquire that good or service increases, and they must make more tradeoffs to acquire the more expensive product.

The chart below depicts the law of demand using a demand curve, which is always downward sloping. Each point on the curve (A, B, C) reflects a direct correlation between quantity demanded (Q) and price (P). So, at point A, the quantity demanded will be Q1 and the price will be P1, and so on.

The law of demand is so intuitive that you may not even be aware of all the examples around you.

-When shirts go on sale, you might buy three instead of one. The quantity that you demand increases because the price has fallen.

-When plane tickets become more expensive, you’re less likely to travel by air and more likely to choose the less expensive options of driving or staying home. A number of plane tickets that you demand decreases to zero because the cost has gone up.

The law of demand summarizes the effect price changes have on consumer behavior. For example, a consumer will purchase more pizzas if the price of pizza falls. The opposite is true if the price of pizza increases. John might demand 10 pizzas if they cost $10 each, but only 7 pizzas if the price rises to $12, and only 4 pizzas if the price rises to $20.

Think of it this way: Americans demand cocaine, thus, Mexico will supply cocaine because there is a demand that needs to be met. Mexico’s labour market and infrastructure is a fraction of that in the United States, and therefore, there is more incentive for Mexicans to partake in illegal activities to make money because there are less opportunities for them to make an honest living than if they were to live in the United States. 

Where there is a market, there will always exist a demand for certain goods and services, and when there is a demand, there must also be a supply to fulfill that demand; where there is money to be made, you can expect an economy to fill that void.

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    • Thanks for the kind words! I checked out your blog, awesome stuff! Can I get your e-mail by any chance? I have an opportunity I think you may be interested in – David

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