| Price (dollar per tonne) | Quantity demanded (kilo tonnes) | Quantity supplied (kilo tonnes) |
| 100 | 2,000 | 0 |
| 150 | 1,400 | 600 |
| 200 | 1,200 | 800 |
| 250 | 1,000 | 1,000 |
| 300 | 800 | 1,200 |
| 350 | 600 | 1,400 |
| 400 | 0 | 2,000 |
| Price (dollar per tonne) | Quantity demanded (kilo tonnes) | Quantity supplied (kilo tonnes) |
| 100 | 2,000 | 0 |
| 150 | 1,400 | 600 |
| 200 | 1,200 | 800 |
| 250 | 1,000 | 1,000 |
| 300 | 800 | 1,200 |
| 350 | 600 | 1,400 |
| 400 | 0 | 2,000 |
Before the price floor consumer surplus= 0.5*(400-250)*1000=75000
After the price floor, consumer surplus= 0.5*(400-300)*800= 40000
Before the price floor producer surplus= 0.5*(250-100) *1000=75000
After the price floor producer surplus= 0.5*(200-100)*800=40000
Deadweight loss= 0.5*(300-200)*(1000-800)
=10000
Global Markets in Action – International Trade Restrictions
Import Tariffs
Korea imports a large quantity of beef. With no beef trade, Korea’s equilibrium price for beef was $8 million per kilo tonne and equilibrium quantity was 375 kilo tonne. If Korea opens its beef market to trade with no tariff, domestic demand would be 625 kilo tonne and domestic supply would be 125 kilo tonne at the world price of $4 million per kilo tonne. However, Korea currently imposes 40 per cent tariff rate on all imported beef. With 40 per cent tariff, Korea’s domestic supply and domestic demand were 250 kilo tonne and 500 kilo tonne respectively in 2013. Assume that intercept of supply curve is $2 million and demand curve is $15 million per kilo tonne.
The welfare changes can be shown as follows:
| Importing Country | |
| Consumer Surplus | ? (A+B+C+D) |
| Producer Surplus | +A |
| Govt. Revenue | +C |
| National Welfare | ?B?D |
| Importing Country | |
| Consumer Surplus | ? (A+B+C+D) |
| Producer Surplus | +A |
| Quota rent | +(C+G) |
| National Welfare | G?B?D |
| Exporting Country | |
| Consumer Surplus | +e |
| Producer Surplus | -( e+f+g+h) |
| Quota rent | 0 |
| National Welfare | -(f+g+h) |
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