The correct interpretation of a difference in Gini coefficients for the United States and China is:
The United States and China differ in how evenly income is distributed among individuals.
The Gini coefficient is a measure of income inequality within a population, with a value of 0 representing perfect equality (everyone has the same income) and a value of 1 indicating maximum inequality (one person has all the income, and everyone else has none). Therefore, a difference in Gini coefficients would indicate a difference in income distribution between the two countries.