Identify the structure indicated by the number 4 in the figure below. 
Definitions:
Industrial Nations
Countries that are characterized by a significant level of industrialization, with a major part of their economy coming from manufacturing and services.
Total Compensation
The complete package of wages, benefits, bonuses, and any other form of compensation given to employees for their service.
Take-Home Pay
The amount of income left after deductions such as taxes, social security, and other withholdings have been subtracted from the gross pay.
Principal-Agent Problem
A dilemma in economics where one party (the agent) is tasked to make decisions on behalf of another party (the principal), leading to potential conflicts of interest.
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