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:
Biological Father
The male parent who has contributed the sperm leading to a child's conception, establishing a genetic connection.
Heritability Ratios
A statistical estimate that indicates how much of a trait's variation within a population can be attributed to genetic differences among individuals.
Phenotypic Variability
The variation in physical and physiological traits among individuals within a population, due to genetic and environmental influences.
Genome
The complete set of genetic material present in a cell or organism.
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