12. Indirect business taxes and capital consump- tion allowance are not income, yet they are. included in order to find GDP as income received. Why do we add these two non- income components to the other components of income (like wages, rent, interest, profits, and net factor income from abroad) to find GDP? 13. Why has nominal GDP increased faster than real GDP in the United States over time? What would it mean if an economy had real GDP increasing faster than nominal GDP? 14. We usually discuss GDP in terms of what is included in the definition. What is not included in GDP? Why are these things excluded? 15. If a surfboard is produced this year but not sold until next year, how is it counted in this year's GDP and not next year's? group will define its measure and tell how it dif-