An increase in marginal tax rates will O allow taxpayers to keep more of what they earn. make tax deductible purchases more expensive. reduce the share of additional earnings that individuals are permitted to keep. . increase the incentive of individuals to earn additional income. Question 24 1 pts The basic difference between macroeconomics and microeconomics is: O microeconomics concentrates on the behavior of individual consumers while macroeconomics focuses on the behavior of firms. O microeconomics concentrates on individual markets while macroeconomics focuses primarily on international trade. O microeconomics concentrates on the behavior of individual consumers and firms while macroeconomics focuses on the performance of the entire economy. O microeconomics explores the causes of inflation while macroeconomics focuses on the causes of unemployment