Answer to Question 1
The statement is incorrect. In recent years, higher income groups have gained relatively more than the lower income groups. The Gini ratio has increased, which means that the share of income going to the richest households has increased and the share of income going to the poorest households has decreased.
Answer to Question 2
The statement is incorrect because the marginal rate of substitution decreases as a consumer moves downward along an indifference curve.