Interactive Apps

Topics: Capital Accumulation, Steady State, Depreciation, Savings Rate

Description: Visualize the Solow Growth Model with animated transitions showing how an economy converges to its steady state. This app helps you understand:

• How savings and depreciation determine capital accumulation
• The cobweb dynamics of convergence to steady state K*
• How changes in savings rate, depreciation, or productivity shift the steady state
• The relationship between investment γY(K) and depreciation δK

Features: Cinematic zoom animations, cobweb diagrams, interactive parameter controls, speed adjustment

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Topics: GDP, National Spending Approach, Factor Income Approach

Description: An interactive drag-and-drop game that teaches the two approaches to measuring GDP. This app helps you understand:

• The National Spending (Expenditure) Approach: Y = C + I + G + (X − M)
• The Factor Income Approach: Y = Compensation + Rent + Interest + Profit + Taxes
• How to classify GDP components into the correct category
• How to solve for missing values using the GDP identity

Features: Drag-and-drop tiles, sign selection (+/−), hidden values to calculate, timed leaderboard

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Topics: Total Cost, Variable Cost, Fixed Cost, Marginal Cost, Average Total Cost

Description: Practice the relationships between different cost functions through fill-in-the-blank exercises. This app helps you understand:

• How Total Cost decomposes into Fixed and Variable Costs (TC = FC + VC)
• The relationship between Marginal Cost and Total Cost (MC = TC(Q+1) − TC(Q))
• How to calculate Average Total Cost (ATC = TC / Q)
• How to derive Variable Cost from Marginal Costs

Features: Three difficulty levels, constraint propagation puzzles, shake animation for wrong answers, glassy tile design

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Topics: Trade, Marginal Rate of Substitution (MRS), Utility, Gains from Exchange

Description: Explore how two agents (Crusoe and Friday) can benefit from trade based on their preferences. This app helps you understand:

• How to calculate changes in utility using marginal utilities
• How Marginal Rate of Substitution (MRS) reflects willingness to trade
• When trades are mutually beneficial based on preference differences
• Feasibility constraints in trading economies

Features: Random problem generation, warm-up exercises, interactive sliders, instant feedback with detailed solutions

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Topics: Production, Opportunity Cost, Resource Allocation, Efficiency

Description: Visualize the trade-offs in production when resources are limited. This app helps you understand:

• How factor allocation affects production of different goods
• The concept of opportunity cost in production decisions
• The shape and properties of the production possibility frontier
• Efficient vs. inefficient resource allocation

Features: Interactive sliders to allocate factors, live graph updates, Cobb-Douglas production functions

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