Why might Mattel set a much lower contribution margin on its Barbie dolls than on the accessories

Question:

Why might Mattel set a much lower on its Barbie dolls than on the accessories for the dolls?

Contribution Margin
Contribution margin is an important element of cost volume profit analysis that managers carry out to assess the maximum number of units that are required to be at the breakeven point. Contribution margin is the profit before fixed cost and taxes...