Anna is better off; Bob is the same; this exchange represents a Pareto improvement.

Anna is the same; Bob is worse off; this exchange does not represent a Pareto improvement.

Anna is better off; Bob is worse off; this exchange does not represent a Pareto improvement.

Anna is the same; Bob is better off; this exchange represents a Pareto improvement.

Anna is worse off; Bob is better off; this exchange does not represent a Pareto improvement.

Anna is the same; Bob is the same; this exchange does not represent a Pareto improvement.

Anna is worse off; Bob is the same; this exchange does not represent a Pareto improvement.

Anna is better off; Bob is better off; this exchange represents a Pareto improvement.

Anna is worse off; Bob is worse off; this exchange does not represent a Pareto improvement.