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

The diagram illustrates the trend of

price

variation, compared to the values of the previous

month

, for three metals namely

copper

,

nickel

, and

zinc

during 2014.

Overall

, the cost of

nickel

and

copper

decreased, whilst the

price

of

zinc

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

nickel

fee had its largest drop in the first two

months

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

while

it had no adjustment in the

last

month

.

Furthermore

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

Firstly

,

nickel

price

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

months

, and after remaining constant for a single

month

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

price

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

months

, up to September. The

price

of

copper

declined for the first two

months

and after a plateau for a

month

, decreased to nearly -1%

price

reversal in the following;

however

,

zinc

price

had a 2% growth in

price

change in February and

then

declined up to June. The

price

of

copper

,

zinc

, and

nickel

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