Policy analysis is a multidisciplinary field that examines how public decisions are made and evaluates their effectiveness, efficiency, and equity. By applying tools from economics, data science, and institutional analysis, students gain a framework for understanding how governments, corporations, and global organizations shape societal outcomes. The field bridges theory and practice, making it crucial for students in business, economics and law who wish to engage with governance or strategic decision-making.
Policy analysts must understand economic trends, regulatory systems, and historical context. Courses in policy analysis often build upon knowledge from macroeconomics, microeconomics, and the history of economic thought. Broader perspectives are shaped by examining economic history, including critical developments in labor history and industrial and technological history.
Effective policy recommendations also require strong analytical and technical skills. Training in business analytics, data analysis, and operations research equips students to assess policy outcomes quantitatively. In today’s data-rich environment, emerging tools such as deep machine learning, reinforcement learning, and information technology are increasingly used in simulations and predictive modeling.
Beyond technical skills, policy analysts must understand the fiscal and institutional landscape. Knowledge of auditing, budgeting and cost management, and finance is critical for evaluating the viability and sustainability of policy choices. Broader fiscal considerations are explored through topics like taxation and fiscal policy. Issues such as contract negotiation and organizational strategy are often addressed within business administration training.
Policy-making doesn’t exist in a vacuum—it is shaped by the evolution of global markets and commerce. By analyzing case studies in trade and commerce history or evaluating contemporary financial systems through investment and portfolio management, students understand how historical patterns inform modern policy. Finally, policy implementation is increasingly tied to innovation, as seen in fields like emerging technologies and network management and administration, which reshape how societies respond to complex challenges.
In summary, policy analysis is a versatile and essential discipline that enables informed public decision-making. Whether shaping economic policy, managing institutional reform, or advising on national budgets, students with expertise in policy analysis are well-positioned to drive impactful change.

Evaluating Economic Policies and Their Impact on Systems and Behaviour
Key Objectives of Policy Analysis:
- Effectiveness: Evaluating whether policies achieve their intended objectives.
- Efficiency: Analyzing resource allocation to maximize benefits while minimizing costs.
- Equity: Ensuring fair distribution of policy impacts across different societal groups.
- Sustainability: Assessing the long-term viability and environmental implications of policies.

Policy analysis serves as a critical tool for shaping policies that address contemporary challenges while fostering social and economic progress.
Interactive Policy Cost-Benefit & NPV Simulator
Evaluate public policy investments by adjusting initial capital cost ($B), annual benefit yield ($M), discount rate (r), and time horizon (years) to calculate Net Present Value (NPV).
Key Topics in Policy Analysis
Taxation: Examining the Effects of Different Tax Structures on Income Distribution
- Definition: Taxation policies involve levying taxes on individuals and businesses to generate public revenue. Policy analysis evaluates the impact of various tax structures on economic behavior and income distribution.
- Key Components:
- Progressive Taxation: Higher-income groups pay a larger percentage of their income in taxes.
- Flat Taxes: All taxpayers pay the same percentage of their income.
- Corporate Taxes: Levies on business profits and their implications for investment and growth.
- Applications:
- Designing tax systems that reduce income inequality without discouraging productivity.
- Assessing the trade-offs between tax incentives for businesses and public revenue needs.
- Examples:
- Analyzing the impact of increased capital gains taxes on investment behavior.
- Evaluating the redistributive effects of a progressive income tax system.
Public Spending: Assessing the Allocation of Resources for Health, Education, and Infrastructure
- Definition: Public spending refers to government expenditures on services and projects that promote societal welfare. Policy analysis examines how these expenditures influence economic growth and social equity.
- Key Components:
- Healthcare: Funding programs to improve access to medical services.
- Education: Allocating resources to enhance quality and accessibility of education.
- Infrastructure: Investing in transportation, energy, and communication systems.
- Applications:
- Prioritizing spending on sectors with the highest social returns.
- Identifying inefficiencies and corruption in public expenditure.
- Examples:
- Evaluating the economic impact of universal healthcare programs.
- Analyzing the effects of increased spending on public transportation infrastructure.
Regulations: Evaluating the Impact of Environmental, Labor, and Trade Policies
- Definition: Regulations are rules established by governments to achieve specific economic, social, or environmental objectives. Policy analysis assesses the costs, benefits, and unintended consequences of these regulations.
- Key Components:
- Environmental Policies: Carbon taxes, renewable energy mandates, and pollution controls.
- Labor Regulations: Minimum wage laws, workplace safety standards, and union rights.
- Trade Policies: Tariffs, quotas, and free trade agreements.
- Applications:
- Designing regulatory frameworks that balance economic growth with sustainability.
- Assessing the impact of labor laws on employment rates and worker productivity.
- Examples:
- Analyzing the effectiveness of carbon taxes in reducing greenhouse gas emissions.
- Studying the implications of minimum wage increases on small businesses and workers.
Applications of Policy Analysis
Designing Programs to Reduce Income Inequality and Poverty
- Overview: Policy analysis informs the design of initiatives that promote equitable economic opportunities and address poverty.
- Applications:
- Evaluating the effectiveness of social welfare programs like food assistance or unemployment benefits.
- Assessing the impact of wage subsidies and job training programs on reducing poverty.
- Examples:
- Analyzing the economic implications of introducing a universal basic income (UBI).
- Evaluating the effectiveness of microfinance programs in empowering low-income entrepreneurs.
Implementing Policies to Boost Innovation and Entrepreneurship
- Overview: Policy analysis supports the development of strategies that foster technological innovation and entrepreneurial growth.
- Applications:
- Designing tax incentives for startups and R&D investments.
- Assessing the impact of intellectual property laws on innovation.
- Examples:
- Studying the effects of government grants for clean energy startups.
- Evaluating the role of patent protection in promoting pharmaceutical innovation.

Examples of Policy Analysis in Action
Analyzing the Economic Implications of a Universal Basic Income Program
- Scenario: A government considers implementing a UBI to address poverty and job displacement caused by automation.
- Outcome: Policy analysis evaluates the program’s costs, funding mechanisms, and potential effects on labor market participation, providing recommendations for effective implementation.
Studying the Effectiveness of Carbon Taxes in Reducing Emissions
- Scenario: A country implements a carbon tax to curb greenhouse gas emissions and promote clean energy adoption.
- Outcome: Policy analysis assesses the tax’s impact on emission levels, economic growth, and energy prices, suggesting adjustments to maximize environmental benefits while minimizing economic burdens.
Emerging Trends in Policy Analysis
Data-Driven Policymaking
- Leveraging big data, AI, and machine learning to analyze complex policy issues.
- Examples: Using predictive analytics to forecast the long-term impacts of healthcare reforms.
Behavioral Insights in Policy Design
- Incorporating psychological and behavioral economics principles to influence public behavior.
- Examples: Nudging citizens to save for retirement through default enrollment in pension plans.
Sustainability and Climate Policies
- Evaluating the effectiveness of policies aimed at mitigating climate change and promoting green economies.
- Examples: Assessing renewable energy subsidies and carbon trading systems.
Global Policy Coordination
- Analyzing international collaborations on issues like trade, security, and pandemics.
- Examples: Evaluating the effectiveness of global health initiatives like COVAX.
Equity-Focused Analysis
- Ensuring that policies address systemic inequalities and promote social justice.
- Examples: Assessing the impact of housing policies on marginalized communities.

Challenges in Policy Analysis
Complexity of Issues
- Addressing multifaceted problems with interdependent variables, such as climate change or healthcare reform.
Data Limitations
- Ensuring access to accurate, timely, and comprehensive data for analysis.
Political and Public Resistance
- Overcoming opposition to policies due to ideological differences or miscommunication.
Unintended Consequences
- Identifying and mitigating negative side effects of policies, such as market distortions or equity issues.
Global Interdependencies
- Navigating the ripple effects of domestic policies on international markets and relations.
Why Study Policy Analysis
Understanding How Decisions Shape Society
Policy analysis focuses on evaluating the design, implementation, and outcomes of public policies. It helps explain how government decisions impact education, healthcare, the environment, social welfare, and the economy. For students preparing for university, studying policy analysis provides insight into how complex societal problems are addressed through structured decision-making, equipping them to think critically about real-world challenges and possible solutions.
Developing Research, Data, and Evaluation Skills
Policy analysis requires gathering evidence, interpreting data, and assessing the effectiveness of programs and interventions. Students learn to frame research questions, compare alternatives, and use quantitative and qualitative tools to inform recommendations. These analytical and evaluative skills are highly transferable to university-level research projects, essay writing, and coursework in social sciences, economics, political science, and public administration.
Balancing Evidence, Ethics, and Practical Constraints
A key strength of policy analysis is its emphasis on weighing costs, benefits, and unintended consequences. Students explore how values, stakeholder interests, and political realities influence policy choices. This approach encourages careful judgment, ethical reasoning, and a nuanced understanding of public decision-making—essential qualities for meaningful engagement in university seminars, debates, and interdisciplinary projects.
Connecting Theory with Public Impact
Policy analysis bridges academic theory and practical application by focusing on real-life outcomes. Students examine case studies involving climate policy, public health, urban development, or education reform. These practical examples help students see the direct connection between classroom learning and the policies that shape communities, governments, and global systems.
Preparing for Public Service and Strategic Careers
A foundation in policy analysis opens pathways to careers in government, international organizations, NGOs, consulting, and think tanks. It is also an excellent starting point for further studies in law, economics, environmental studies, or political science. For students entering university, policy analysis offers a compelling and impactful academic focus—one that combines research, strategy, and public service to make a real difference in the world.

Policy Analysis: Conclusion
Policy analysis is an essential discipline for evaluating public policies and guiding decision-making in diverse domains such as taxation, public spending, and regulation. By focusing on effectiveness, efficiency, equity, and sustainability, policy analysis helps design initiatives that address societal challenges and promote economic growth. As emerging trends like data-driven policymaking and sustainability reshape the field, policy analysis will continue to evolve, offering innovative solutions to complex global problems. Through its rigorous methodologies and real-world applications, policy analysis plays a pivotal role in shaping a more equitable, sustainable, and prosperous future for societies worldwide.
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Frequently Asked Questions – Policy Analysis in Economics
What is policy analysis in economics?
Policy analysis in economics is the systematic study of how government actions—such as taxes, subsidies, regulations, and public spending—affect individuals, firms, and the wider economy. It uses economic theory, data, and reasoning to evaluate different policy options and to weigh their costs, benefits, trade-offs, and unintended consequences.
Why is policy analysis important for students preparing for university?
Policy analysis is important because many real-world debates—about housing, healthcare, education, climate change, inequality, and growth—are fundamentally about policy choices. Learning how to analyse policies helps students interpret news, understand political arguments, and prepare for degrees in economics, public policy, law, international relations, and business.
Which school subjects provide a good foundation for studying policy analysis?
Helpful subjects include mathematics, economics or business studies, geography, history, social studies, and literature. Mathematics and statistics support data analysis. Economics introduces concepts such as incentives and market failures. Humanities and social sciences build skills in reading, writing, argumentation, and understanding institutions and historical context.
What types of public policies do economists commonly analyse?
Economists analyse a wide range of policies, including taxes and transfers, minimum wages, price controls, environmental regulations, trade and industrial policy, education and healthcare funding, housing policy, competition and regulation, social insurance, and fiscal and monetary measures used to stabilise the economy.
How do economists evaluate whether a policy is effective?
Economists evaluate policies using criteria such as efficiency, equity, cost-effectiveness, and feasibility. They ask whether a policy achieves its stated goals, whether benefits exceed costs, how impacts are distributed across groups, and whether there are better alternatives. They often use models, data, and empirical methods such as natural experiments or randomised trials.
What role does data and evidence play in policy analysis?
Data and evidence are central to modern policy analysis. Economists use datasets, surveys, experiments, and statistical techniques to estimate the impact of policies, test hypotheses, and challenge assumptions. Evidence-based policy aims to ground decisions in rigorous analysis rather than intuition, ideology, or anecdote, while also recognising that evidence is never perfect.
How does economics-based policy analysis connect with ethics and values?
Economics can describe trade-offs and measure outcomes, but decisions about which goals matter most involve ethics and values. Policy analysis therefore combines positive analysis (what happens if we do X?) with normative questions (is this fair, sustainable, or acceptable?). Students learn to separate facts from value judgments while still engaging with moral questions openly.
What skills are developed through studying policy analysis?
Policy analysis develops skills in structured problem-solving, critical thinking, data interpretation, clear writing, and persuasive communication. Students learn to define problems precisely, map stakeholders and incentives, identify relevant evidence, construct logical arguments, and explain complex trade-offs in accessible language to different audiences.
How does policy analysis link economics with politics and law?
Economics helps clarify the likely effects of policies, but politics and law shape what is possible. Policy analysis often sits at the intersection of these fields: it uses economic tools to assess options, recognises that political institutions and power influence which options are chosen, and works within legal frameworks that enable or constrain government action.
What careers can knowledge of policy analysis lead to?
Knowledge of policy analysis is useful in careers in government ministries and agencies, central banks, international organisations, think tanks, NGOs, consulting, journalism, and corporate public affairs. Many roles in law, business strategy, and sustainability also rely on understanding how public policies are designed, evaluated, and implemented.
How can I start preparing now if I am interested in policy analysis?
You can start by following policy debates in the news, reading opinion pieces critically, and asking what evidence supports each claim. Practise summarising policy problems, listing possible solutions, and identifying who gains or loses. Building strength in maths, statistics, writing, and debate will also help you engage with policy analysis at university level.
How does the Policy Analysis page on Prep4Uni.online support my learning?
The Policy Analysis page on Prep4Uni.online introduces key ideas such as efficiency and equity, market failures, evidence-based policy, and the role of institutions in a student-friendly way. It connects policy analysis to core economics topics and to related areas such as public policy, law, development, and international relations, helping you explore degree options and future career paths.
Policy Evaluation & Cost-Benefit Analytics Module
Section 1: Foundational Review Questions
- What is policy analysis?
Answer: Policy analysis is the systematic evaluation of public policies, involving the collection and assessment of data to determine their effectiveness, costs, and benefits. It helps decision-makers develop, implement, and adjust policies to address economic and social issues. - Why is policy analysis critical in economic decision-making?
Answer: Policy analysis provides a framework for understanding the potential impacts of government actions on the economy. It enables policymakers to assess trade-offs, forecast outcomes, and make informed decisions that promote sustainable growth and social welfare. - What are the key steps in conducting a policy analysis?
Answer: The key steps include problem identification, setting objectives, data collection, analysis using quantitative and qualitative methods, and evaluating policy alternatives. These steps help ensure that the chosen policy effectively addresses the identified issue. - How does cost-benefit analysis assist in policy evaluation?
Answer: Cost-benefit analysis compares the expected benefits of a policy with its costs, helping determine if the policy is economically viable. This method quantifies impacts in monetary terms, guiding policymakers toward decisions that maximize net benefits. - What role do economic models play in policy analysis?
Answer: Economic models simplify complex real-world interactions, allowing analysts to simulate the effects of policy changes. These models help predict outcomes such as changes in GDP, employment, and inflation, making them essential tools for policy evaluation. - How do qualitative factors complement quantitative analysis in policy evaluation?
Answer: Qualitative factors, such as public opinion and stakeholder values, provide context to numerical data obtained through quantitative analysis. They help capture the broader social and cultural impacts of policies, leading to more comprehensive evaluations. - What is the significance of stakeholder analysis in policy formulation?
Answer: Stakeholder analysis identifies and evaluates the interests and influences of different groups affected by a policy. Understanding these perspectives is crucial for designing policies that are equitable and have broad support, reducing resistance during implementation. - How do uncertainty and risk affect policy analysis outcomes?
Answer: Uncertainty and risk can lead to variations in policy outcomes by affecting forecast accuracy and data reliability. Analysts use sensitivity analysis and scenario planning to account for these factors, ensuring that policies remain effective under different conditions. - What is the difference between ex-ante and ex-post policy evaluation?
Answer: Ex-ante evaluation is conducted before policy implementation to predict potential outcomes, while ex-post evaluation is performed after implementation to assess actual impacts. Both are essential for improving policy design and effectiveness over time. - How can policy analysis inform public decision-making?
Answer: Policy analysis provides evidence-based insights that help public officials understand the likely effects of various policy options. By quantifying benefits and costs, it supports rational decision-making and optimal resource allocation to maximize societal welfare.
Section 2: Analytical & Thought-Provoking Scenarios (Collapsible)
1. How might emerging digital technologies reshape policy analysis methodologies in the future?
2. In what ways can integrating sustainability considerations into policy analysis improve long-term economic outcomes?
3. How does the application of cost-benefit analysis help in the formulation of effective public policies?
4. What are the implications of information asymmetry for policy analysis, and how can governments mitigate its effects?
5. How can uncertainty and risk be incorporated into policy analysis models to enhance decision-making?
6. What are the challenges of evaluating long-term policy impacts, and how can policymakers address these challenges?
7. How does the concept of opportunity cost influence public policy decisions in resource-constrained environments?
8. In what ways can public participation enhance the policy analysis process?
9. How might behavioral economics contribute to a more nuanced understanding of policy impacts on consumer behavior?
10. What are the implications of income distribution changes on the effectiveness of fiscal policies?
11. How might advances in data collection and analysis transform policy evaluation in public economics?
12. What challenges arise when evaluating long-term policy interventions, and how can these be addressed?
Section 3: Numerical Problems & Applied Calculation Solutions
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Problem 1: Real GDP & Deflator Inflation Growth
Year 1 Nominal GDP is $500B (Deflator = 110). Year 2 Nominal GDP rises to $550B (Deflator = 115). Calculate Real GDP for both years, Nominal Growth Rate, and Real Growth Rate.
Solution & Step-by-Step Calculation:Step 1 (Real GDP):
Real GDP1 = $500B × 100 / 110 = $454.55B.
Real GDP2 = $550B × 100 / 115 = $478.26B.
Step 2 (Nominal Growth Rate):
Nominal Growth = [($550B – $500B) / $500B] × 100 = 10.00%.
Step 3 (Real Growth Rate):
Real Growth = [($478.26B – $454.55B) / $454.55B] × 100 = 5.22%. -
Problem 2: Keynesian Spending Multiplier
If the Marginal Propensity to Consume (MPC) is 0.80, calculate the fiscal multiplier. Determine total GDP expansion if government spending increases by $50B.
Solution & Step-by-Step Calculation:Step 1: Fiscal Multiplier k = 1 / (1 – MPC) = 1 / (1 – 0.80) = 1 / 0.20 = 5.00.
Step 2: Total GDP Increase = k × ΔG = 5.00 × $50B = $250.00B. -
Problem 3: Per-Unit Tax Incidence Analysis
Demand is Qd = 300 – 3P and supply is Qs = 2P – 20. If a $5 per-unit tax is imposed on sellers, calculate the new buyer price, new quantity, and tax incidence split.
Solution & Step-by-Step Calculation:Step 1 (Pre-tax Equilibrium): 300 – 3P = 2P – 20 ⇒ 320 = 5P ⇒ P1 = $64, Q1 = 108 units.
Step 2 (Post-tax Supply): Qs‘ = 2(P – 5) – 20 = 2P – 30.
Step 3 (New Equilibrium Price): 300 – 3P = 2P – 30 ⇒ 330 = 5P ⇒ Pbuyer = $66.00.
New Quantity Q2 = 300 – 3(66) = 102 units.
Step 4 (Tax Incidence): Buyer price rises by $66 – $64 = $2.00 (40%). Seller receives $66 – $5 = $61, bearing $64 – $61 = $3.00 (60%). -
Problem 4: Opportunity Cost in Public Budgeting
A government can produce either 4,000 units of Good X or 2,000 units of Good Y. If it allocates resources to produce 3,000 units of Good X, calculate the opportunity cost in Good Y foregone.
Solution & Step-by-Step Calculation:Step 1: Full capacity ratio = 2,000 Y / 4,000 X = 0.5 units of Y per unit of X.
Step 2: Reduced X capacity = 4,000 – 3,000 = 1,000 units of X.
Step 3: Opportunity Cost = 1,000 × 0.5 = 500 units of Good Y foregone. -
Problem 5: Point Price Elasticity Calculation
Given demand function Q = 500 – 5P, calculate point price elasticity of demand when price is $50.
Solution & Step-by-Step Calculation:Step 1: At P = $50, Q = 500 – 5(50) = 250 units.
Derivative dQ/dP = -5.
Step 2: Point Elasticity = (dQ/dP) × (P / Q) = -5 × (50 / 250) = -5 × 0.20 = -1.0 (Unitary Elasticity). -
Problem 6: Consumer Surplus Calculation
Given demand function Q = 400 – 4P, calculate consumer surplus at an equilibrium price of $60.
Solution & Step-by-Step Calculation:Step 1: Choke Price (Q = 0): 0 = 400 – 4P ⇒ Pchoke = $100.
Step 2: Quantity at P = 60: Q = 400 – 4(60) = 160 units.
Step 3: CS = 0.5 × ($100 – $60) × 160 = 0.5 × 40 × 160 = $3,200. -
Problem 7: Open Economy Spending Multiplier
Given MPC = 0.75 and Marginal Propensity to Import (MPI) = 0.25, calculate the open economy fiscal multiplier and total GDP effect from a $30B spending increase.
Solution & Step-by-Step Calculation:Step 1: Open Economy Multiplier k = 1 / (1 – MPC + MPI) = 1 / (1 – 0.75 + 0.25) = 1 / 0.50 = 2.00.
Step 2: Total GDP Effect = 2.00 × $30B = $60.00B. -
Problem 8: Zero Real Growth Evaluation
Nominal GDP increases from $800B to $880B. The GDP deflator increases from 120 to 132 over the same period. Calculate real GDP for both years and real growth rate.
Solution & Step-by-Step Calculation:Step 1: Real GDP1 = $800B × 100 / 120 = $666.67B.
Real GDP2 = $880B × 100 / 132 = $666.67B.
Step 2: Real GDP Growth Rate = [($666.67B – $666.67B) / $666.67B] × 100 = 0.00% (Pure nominal inflation growth). -
Problem 9: Discounted Cost-Benefit Analysis (NPV)
A public policy costs $2.0B upfront and generates benefits of $300M ($0.3B) per year for 10 years at a discount rate of 8%. Calculate Net Present Value (NPV).
Solution & Step-by-Step Calculation:Step 1: PV Annuity Factor at 8% for 10 years = [1 – (1 + 0.08)-10] / 0.08 = [1 – 0.46319] / 0.08 = 6.7101.
Step 2: Present Value of Benefits = $0.3B × 6.7101 = $2.013B ($2,013M).
Step 3: NPV = PV Benefits – Upfront Cost = $2.013B – $2.000B = +$0.013B (+$13.00M). The project is economically viable. -
Problem 10: Tax Impact on Consumer Surplus
Demand is Q = 600 – 6P and supply is Q = 2P – 10. Calculate initial equilibrium. Then, if a $4 per-unit tax is imposed on consumers, calculate the change in consumer surplus.
Solution & Step-by-Step Calculation:Step 1 (Pre-tax): 600 – 6P = 2P – 10 ⇒ 610 = 8P ⇒ P1 = $76.25, Q1 = 142.50 units.
Choke price = $100. CS1 = 0.5 × ($100 – $76.25) × 142.50 = 0.5 × 23.75 × 142.50 = $1,692.19.
Step 2 (Post-tax Consumer Price): Effective price paid is (P + 4).
600 – 6(P + 4) = 2P – 10 ⇒ 576 – 6P = 2P – 10 ⇒ 586 = 8P ⇒ Producer price P = $73.25.
Total price paid by consumer = $73.25 + $4 = $77.25. New Quantity Q2 = 136.50 units.
Step 3 (Post-tax CS): CS2 = 0.5 × ($100 – $77.25) × 136.50 = 0.5 × 22.75 × 136.50 = $1,552.69.
Step 4 (Change in CS): $1,552.69 – $1,692.19 = -$139.50 (Loss of $139.50). -
Problem 11: Public Health vs. Education Trade-off
A public budget can supply 15,000 healthcare services or 9,000 education services. If government allocates resources to provide 10,000 healthcare services, calculate the opportunity cost in education services foregone.
Solution & Step-by-Step Calculation:Step 1: Trade-off ratio = 9,000 education / 15,000 healthcare = 0.60 education services per healthcare service.
Step 2: Unused healthcare capacity = 15,000 – 10,000 = 5,000 services.
Step 3: Opportunity cost = 5,000 × 0.60 = 3,000 education services foregone. -
Problem 12: Tax Cut Multiplier Calculation
In an economy with MPC = 0.85, the government implements a tax cut of $40B. Calculate the tax multiplier, total GDP expansion, and percentage increase if baseline GDP is $800B.
Solution & Step-by-Step Calculation:Step 1: Tax Multiplier ktax = -MPC / (1 – MPC) = -0.85 / (1 – 0.85) = -0.85 / 0.15 = -5.67.
Step 2: Total Impact on GDP = ktax × (ΔTax) = -5.67 × (-$40B) = +$226.80B.
Step 3: Percentage Increase = ($226.80B / $800B) × 100 = 28.35%.