[A] statistical measure of inequality that describes how equal or unequal income or wealth is distributed among the population of a country.

[B] A graphical distribution of wealth, showing the proportion of income earned by any given percentage of the population.

[C] if tax rates are increased above a certain level, then tax revenues can actually fall because higher tax rates discourage people from working.

[D] hypothesis that economic growth initially leads to greater inequality, followed later by the reduction of inequality.