The principles of feedback and control are not restricted to engineering and biological systems. There are many applications and occurrences of feedback control concepts in the socioeconomic and political arena. Society is composed of many feedback systems and regulatory bodies that are controllers exerting the forces on society necessary to maintain a desired output. Explain how a simplified model of the national income feedback control system can be represented as shown in Figure 1.12.

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Private business. Investment National Desired Income Government Business Productions National + Income Consumer Government Spending Spending Consumers Measure Tax Deductions Figure 1.12 Application of the principles of feedback to economic systems.