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

The diagram illustrates the trend of

price

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variation, compared to the values of the previous

month

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, for three metals namely

copper

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,

nickel

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, and

zinc

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during 2014.

Overall

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, the cost of

nickel

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and

copper

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decreased, whilst the

price

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of

zinc

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had a slight increase in 2014 from January to December. The

nickel

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fee had its largest drop in the first two

months

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of the year, which was the highest point of all time,

while

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it had no adjustment in the

last

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month

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.

Furthermore

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, all values remained constant in July, April, and September.

Firstly

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,

nickel

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price

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steadily decreased from 6% to 1% in the first two

months

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, and after remaining constant for a single

month

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afterwards, it again lowered another 4% and reached the lowest peak in June which was -3%. In the following, the

price

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revision dramatically soared and reached -1% and stayed in that status for three

months

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, up to September. The

price

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of

copper

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declined for the first two

months

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and after a plateau for a

month

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, decreased to nearly -1%

price

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reversal in the following;

however

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,

zinc

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price

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had a 2% growth in

price

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change in February and

then

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declined up to June. The

price

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of

copper

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,

zinc

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, and

nickel

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remained constant from July to September which were around 1%, -0.5%, and -1% respectively.