Unit 2:EU tariffs on Chinese candles

AP reorts the EU is putting variable tariffs on imports of Chinese candles for the next 6 months

http://www.google.com/hostednews/ap/article/ALeqM5jY-DSfzHnGwnfJsKxyAcn02B26yQD94FECD00

a) Explain what a tariff is
b) Using a suitable diagram, comment on the effect of the tariff on EU consumers