Microeconomics: If the cross-price elasticity of two goods is negative, then those two goods are "compliments"

Question

What if its a "postive relationship"... what type of good is that? (Normal, necessity, luxury, all the above or none?)

Answer 1

For positive cross-price elasticity of demand goods/services will be substitutes for each-other.

http://en.wikipedia.org/wiki/Cross_elast...