The value of share goes down

[intel]

Test No. incompl/inter-8 "Going on foot", question 10

As they always tell you the value of shares can go ......... as well as up.

(a) across
(b) over
(c) down
(d) in

Test No. incompl/inter-8 "Going on foot", answer 10

As they always tell you the value of shares can go down as well as up.

Correct answer: (c) down

Your answer was: incorrect
As they always tell you the value of shares can go over as well as up.
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why do we use go down but not go over? can you kindly explain to me?

[Torsten]

Go down in this sentence means fall. The value of shares can fall or climb (go down or go up).
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Test Of English for International Communication
TOEIC Preparation & TOEIC Vocabulary