What is the most likely explanation for the dark area in the figure shown below? 
Definitions:
Corporate Income Tax
Taxes levied on the profits earned by corporations, which vary by country and influence companies' financial strategies.
Excise Taxes
Taxes levied on the sale of specific goods and services, such as gasoline, cigarettes, and alcohol.
Fiscal Year
A fiscal year is a one-year period that companies and governments use for accounting purposes and preparing financial statements, which does not necessarily align with the calendar year.
Social Security Tax
Taxes collected to fund the Social Security program, providing benefits for retirement, disability, and survivors.
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