The graph below shows the average monthly change in the prices of three metals during 2014.

The presented chart describes during every 30 days the quantity of percentage by

wich

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which

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the

prize

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price

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of three different types of metals, copper, nickel and zinc, changed compared with the previous months.

Overall

, all of the three lines, that represent the materials, have a fluctant variation,

although

all began and ended the year with a positive difference

of

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in

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their values.

Futhermore

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Furthermore

, nickel and zinc have a similar trend, in

fact

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fact,

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they both present a thorough in June, of -3% and -1%

,

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apply

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and in October, of -2% and -1%, followed

then

by an increase. Despite that, nickel has experienced in the month of January a

consistent

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consistently

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bigger

risen

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rise

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of

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in

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the prizes, by 6%, than zinc. Copper had a more steady

changing

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change

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of its value on the market, despite a decrease

by

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of

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-1% that lasted for 60 days starting from May. In conclusion, all of the prizes remained fully steady for 60 days until September, with a

slighlty

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slight

slightly

decrease afterwards.