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.
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.
In other words, consumers are paying $1650 in order to benefit producers $550 so price supports are considered inefficient.
The deadweight loss is the efficiency lost by implementing the price-support system.
It is the change in total surplus and includes the value of the government purchase, and is equal to $1100.