Abby and Sofia both like My Little Pony toys and Matchbox cars. What is the value of each child's marginal rate of substitution at point A? Explain whether that point is or is not a Pareto-efficient outcome. 
Definitions:
Marginal Probability
The probability of an event occurring, irrespective of the outcomes of other variables.
P(A or B)
The probability that at least one of two events A or B occurs.
Outcome
The result or consequence of an action, experiment, or situation.
Conditional Probability
The probability of one event occurring with some relationship to one or more other events.
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