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In economics, a price support may be either a subsidy or a price control, both with the intended effect of keeping the market price of a good higher than the competitive equilibrium level.

In the case of a price control, a price support is the minimum legal price a seller may charge, typically placed above equilibrium. It is the support of certain price levels at or above market values by the government.

A price support scheme can also be an agreement set in order by the government, where the government agrees to purchase the surplus of at a minimum price. For example, if a price floor were set in place for agricultural wheat commodities, the government would be forced to purchase the resulting surplus from the wheat farmers (thereby subsidizing the farmers) and store or otherwise dispose of it.

## Short term effects of price supports

### Example

Consider a hypothetical market in which supply and demand are such that the equilibrium price and quantity are \$5 and 500 units, respectively. The government then institutes a price floor at \$6 per unit.

 Price = \$5 Quantity = 500 Consumer Surplus = \$1,250 Producer Surplus = \$1,250 The government agrees to pay \$6 per unit, setting market price at \$6 At this price: consumers buy 400 units producers supply 600 units To maintain a price of \$6 per unit, the government buys the surplus of 200 units Consumer Surplus decreases to \$800 Producer Surplus increases to \$1,800

The benefit to producers of the price support is equal to the gain in producer surplus (represented in blue).

• 1,800 - 1,250 = \$550

The cost to consumers of the price support is equal to the loss in consumer surplus (represented in red).

• 1,250 - 800 = \$450

The cost to the government of the price support is equal to the cost of the surplus in the market (represented in gray).

• 6 * 200 = \$1,200

However, since the consumers ultimately pay taxes for the government to purchase the surplus, the total cost to consumers (in the short run) of the price support is the sum of the loss in consumer surplus and the cost of the government purchasing the surplus off the market.

• 450 + 1,200 = \$1,650

In other words, consumers are paying \$1,650 in order to benefit producers \$550. For this reason, price supports are considered inefficient.

The dead weight loss (DWL) is the efficiency lost by implementing price-support system. It is the change in Total Surplus and is equal to \$1,100.00.

Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Price_support — Please support Wikipedia.
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