Refer to the figure below to answer the following questions. 
Figure 7.3.1
The figure shows the market for shirts in Canada,where D is the domestic demand curve and S is the domestic supply curve.The world price is $20 per shirt.Canada imposes a tariff on imported shirts of $4 per shirt.
-Refer to Figure 7.3.1.Canadian producers' ________ from the tariff is ________.
Definitions:
Menstruation
The monthly shedding of the uterine lining, accompanied by bleeding, in people of reproductive age who have not conceived.
Nocturnal Emissions
Involuntary ejaculation of semen during sleep, often associated with sexual dreams.
Fertility
The natural capability to produce offspring; a measure of reproductive ability in both males and females.
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