Answer:
Cross Price Elasticity of Demand is a measure of the complimentary or substitutional nature of two goods. It enables one to know if goods go together or are replacements for each other.
When the Cross Price Elasticity is Positive then both of the goods are Substitutes.
This is because when the price of one increased, some people abandoned it and went to the other one which then increased the demand of the latter.
If the Cross Price Elasticity is negative then both the goods are compliments because when the price of one increased, people decided to stop buying it and because the other good is a compliment (goes together) people didn't buy the latter either thereby reducing its demand.
The formula for Cross Price Elasticity is,
= % Change in Quantity Demanded of Good A / % Change in price of Good B
Guppy Gummies and Frizzles.
= -4%/ 5%
= - 0.8%
Cross Price Elasticity is Negative so they are Compliments.
It IS RECOMMENDED to market Frizzles with Guppy Gummies.
Guppy gummies and Mookies
= 5% / 5%
= 1
Cross Price Elasticity is positive so these are Substitutes.
It is therefore NOT recommended to market Mookies with Guppy Gummies.