Yeah, I chose that answer too. Supply/demand.
And, using the definition of Inversely; Does that mean the more it is wanted, the less it costs? Color me confused on that one.
World English Dictionary
inverse (ɪnˈvɜːs, ˈɪnvɜːs)

—
adj 1.
opposite or contrary in effect, sequence, direction, etc 2.
maths a. (of a
relationship) containing two variables such that an increase in one results in a decrease in the other:
the volume of a gas is in inverse ratio to its pressure b. (of an
element) operating on a specified member of a set to produce the
identity of the set:
the additive inverse element of x is --x, the multiplicative inverse element of x is 1/x 3. (
usually prenominal ) upside-down; inverted:
in an inverse position —
n 4.
maths a. another name
for reciprocal b. an inverse
element 5.
logic a categorial
proposition derived
from another by changing both the
proposition and its subject from affirmative to negative, or vice versa, as
all immortals are angels from
no mortals are angels [C17: from Latin
inversus, from invertere to invert ]