Consider twogoods: peanut butter and jelly.

 Consider twogoods: peanut butter and jelly. If the price of jelly increases from N$2 a jarto N$3 per jar and the quantity demanded of peanut butter decreases from 50jars to 45 jars, what is the cross elasticity of demand? Are the goodssubstitutes or complements? [4 marks]