Defining the law of Supply and increasing marginal costs - FreeEconHelp.com, Learning Economics... Solved!

## 5/16/11

The law of supply is very similar to the law of demand, but focuses on the firm's perspective.  The law says that as prices go up, the firm is willing to supply more to the market.  This should make sense to all of us, because the more people are willing to pay, the more we are willing to sell!  Imagine if we were in charge of a hamburger stand.  If we could only sell hamburgers for a low price, we may not be motivated to make very many.  But as people are willing to pay more and more for hamburgers, we are willing to work harder to fulfill those orders, and even spend more money on better employees an equipment.  This is price and quantity have a positive relationship with respect to supply.

The genius of these two laws, is that since one slopes down, and the other slopes up, they will cross at one point.  This point is market equilibrium.  By using prices as an allocation device, and assuming that the law of demand and supply hold, we will always attain equilibrium where the amount sold, equals the amount bought, at a given equilibrium price.

The idea of the law of supply stems from the use of marginal costs.  Marginal cost, is the cost a firm faces on the next unit produced (eg. one more quantity, or on the margin).  Imagine you are a manager at a burger restaurant.  It costs you  \$10 per hour for someone to make hamburgers, all of the other costs are assumed away for now (such as buildings, machines, meat, etc.).  If you want to make hamburgers for 1 hour, it will cost you \$10, but if you want to make MORE hamburgers, you will have to pay more to keep your employee around.  But now your employee may want more money to stay around (think of overtime).  So instead of paying \$10 per hour, you now may have to pay \$12.  This is a very simple example of marginal cost theory, and the motivation behind the upward sloping supply curve justifying the law of supply!

After viewing this post, you may be interested in how to construct a supply curve.

It is also possible to construct the supply curve given a supply function. You will need to plug in different values for price and quantity into the supply function to help create a supply schedule. Once you have enough points and a completed supply schedule you can use the information to create a supply curve on the graph. However, if you feel confident with your algebra abilities you can plug in different quantity and price values into the supply function and use the results to plot the supply curve.

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