In economics, what curve illustrates the theoretical relationship between tax rates and the total amount of tax revenue collected by a government?

• The Laffer Curve shows that as tax rates increase from 0%, tax revenue will increase to a maximum point, and then decrease as tax rates continue to rise (because higher rates discourage economic activity).
• The Lorenz Curve represents income or wealth distribution.
• The Phillips Curve illustrates the relationship between inflation and unemployment.
• The Kuznets Curve hypothesizes a relationship between economic growth and income inequality.

The description "relationship between tax rates and the total amount of tax revenue collected by a government" perfectly matches the definition of the Laffer Curve.

The correct answer is A.
$\boxed{\text{A. Laffer Curve}}$