For complements, cross price elasticity of demand is: a. Positive b. Negative c. between zero and one only d. zero.

b. Negative

Explanation:

The cross-price elasticity of demand refers to how the demand for a good should respond when the price of that good changes.  

In this, the substitutes and the complementary goods are considered

In the case of substitutes goods, it shows a positive relationship between the demand and the price of a good. So, the cross-price elasticity of demand is positive

Whereas in the case of the complementary goods, it shows an inverse relationship between the demand and the price of a good. So, the cross-price elasticity of demand is negative

in 342 bc j._c. egypt fell into the hands of the persians, under the reign of nectanebo ii

greek city-states unite in a revolt against the persian empire at the beginning of the fifth century bc. j.-c  

from the year 660 or 659 bc ad, cyrus preached the revolt against the medes to deliver the persians.

for many centuries there were important factors which the economies of the muslim empires developed increasingly. they applied economic procedures in production, investment, finance, taxation and property. they used to tax certain goods (for example: harvest), they charged interest on money lent, they signed contracts with merchants; they relied on a common currency, and they used checks as well as promissory notes. with the money collected by means of taxation, the government provided the needy with an income. in addition, trading networks covered huge distances, so far regions started to have contact and exchange goods. this trade network covered areas of asia, africa and europe.